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A-Z Clan Directory

Irish Surnames & Ancestral Clan Origins

Explore over 200 of the most prominent Irish surnames across the United States. Traced from twelfth-century Gaelic patronymics to the Famine sailing ships and American diaspora settlements.

B C D E F G H J K L M N O Q R S W
B

Surnames Starting With "B"

(7 clans)
Clan Heritage Co. Cork

Barry

de Barra
Meaning: "Spear or Fair-headed"
"Boutez en avant"
Origin & Hubs →
Clan Heritage Co. Donegal

Boyle

Ó Baoighill
Meaning: "Pledge or Danger"
"Dominus providebit"
Origin & Hubs →
Clan Heritage Co. Cavan

Brady

Mac Brádaigh
Meaning: "Spirited or Broad-chested"
"Claritate dextra"
Origin & Hubs →
Clan Heritage Co. Kilkenny

Brennan

Ó Braonáin
Meaning: "Droplet or Sorrow"
"Sub hoc signo vinces"
Origin & Hubs →
Clan Heritage Co. Cork

Buckley

Ó Buachalla
Meaning: "Cowherd or Shepherd"
"Nec temere nec timide"
Origin & Hubs →
Clan Heritage Co. Galway

Burke

de Búrca
Meaning: "Of the Castle or Fortress"
"Ung roy, ung foy, ung loy"
Origin & Hubs →
Clan Heritage Co. Wicklow

Byrne

Ó Broin
Meaning: "Raven"
"Certavi et vici (I have fought and conquered)"
Origin & Hubs →
C

Surnames Starting With "C"

(12 clans)
Clan Heritage Co. Cork

Callaghan

Ó Ceallacháin
Meaning: "Strife or Contention"
"Fidus et audax"
Origin & Hubs →
Clan Heritage Co. Donegal

Campbell

Mac Cathmhaoil
Meaning: "Battle Chief"
"Ne obliviscaris"
Origin & Hubs →
Clan Heritage Co. Offaly

Carroll

Ó Cearbhaill
Meaning: "Fierce in Battle"
"In fide et in bello fortis"
Origin & Hubs →
Clan Heritage Co. Limerick

Casey

Ó Cathasaigh
Meaning: "Vigilant or Watchful"
"Vigila et ora"
Origin & Hubs →
Clan Heritage Co. Fermanagh

Cassidy

Ó Caiside
Meaning: "Curly-haired Physician"
"Frangas non flectes"
Origin & Hubs →
Clan Heritage Co. Carlow

Cavanagh

Caomhánach
Meaning: "Beloved of Saint Kevin"
"Si Deus nobiscum quis contra nos"
Origin & Hubs →
Clan Heritage Co. Galway

Cleary

Ó Cléirigh
Meaning: "Clerk, Scribe, or Scholar"
"Ex virtute honor"
Origin & Hubs →
Clan Heritage Co. Cork

Collins

Ó Coileáin
Meaning: "Young Hound or Pup"
"Vincit veritas"
Origin & Hubs →
Clan Heritage Co. Monaghan

Connolly

Ó Conghaile
Meaning: "Fierce as a Hound"
"En Dieu est mon esperance"
Origin & Hubs →
Clan Heritage Co. Mayo

Conway

Mac Conmidhe
Meaning: "Hound of the Plain"
"Fide et amore"
Origin & Hubs →
Clan Heritage Co. Cork

Crowley

Ó Cruadhlaoich
Meaning: "Hardy Warrior"
"Buadh no bas"
Origin & Hubs →
Clan Heritage Co. Donegal

Cunningham

Mac Cuinneagáin
Meaning: "Leader or Chieftain"
"Over fork over"
Origin & Hubs →
D

Surnames Starting With "D"

(8 clans)
Clan Heritage Co. Westmeath

Daly

Ó Dálaigh
Meaning: "Assembler or Councillor"
"Deo et regi fidelis"
Origin & Hubs →
Clan Heritage Co. Tyrone

Devlin

Ó Dobhailen
Meaning: "Unlucky or Fierce"
"Crux mea stella"
Origin & Hubs →
Clan Heritage Co. Donegal

Doherty

Ó Dochartaigh
Meaning: "Hurtful or Stern"
"Ár nDúchas (Our Heritage)"
Origin & Hubs →
Clan Heritage Co. Cavan

Donohoe

Ó Donnchadha
Meaning: "Dark Warrior"
"Nunquam victus"
Origin & Hubs →
Clan Heritage Co. Cork

Donovan

Ó Donndubháin
Meaning: "Dark-haired Chieftain"
"Vir super hostem"
Origin & Hubs →
Clan Heritage Co. Wexford

Doyle

Ó Dubhghaill
Meaning: "Dark Foreigner (Norse Viking)"
"Fortitudine vincit"
Origin & Hubs →
Clan Heritage Co. Monaghan

Duffy

Ó Dufaigh
Meaning: "Dark or Black-haired"
"Deus adjutor et protector meus"
Origin & Hubs →
Clan Heritage Co. Laois

Dunne

Ó Duinn
Meaning: "Dark or Brown-haired"
"Mullach a buadh"
Origin & Hubs →
E

Surnames Starting With "E"

(1 clans)
Clan Heritage Co. Galway

Egan

Mac Aodhagáin
Meaning: "Son of the Fire-Born"
"Fortitudine et prudentia"
Origin & Hubs →
F

Surnames Starting With "F"

(7 clans)
Clan Heritage Co. Longford

Farrell

Ó Fearghail
Meaning: "Man of Valor"
"Pro Christo et patria"
Origin & Hubs →
Clan Heritage Co. Louth

Finnegan

Ó Fionnagáin
Meaning: "Fair-haired"
"Virtus in arduis"
Origin & Hubs →
Clan Heritage Co. Kildare

Fitzgerald

Mac Gearailt
Meaning: "Son of Gerald"
"Crom a Boo"
Origin & Hubs →
Clan Heritage Co. Laois

Fitzpatrick

Mac Giolla Phádraig
Meaning: "Follower of Saint Patrick"
"Fortis sub forte fatiscet"
Origin & Hubs →
Clan Heritage Co. Roscommon

Flanagan

Ó Flannagáin
Meaning: "Reddish or Ruddy"
"Certavi et vici"
Origin & Hubs →
Clan Heritage Co. Roscommon

Flynn

Ó Floinn
Meaning: "Ruddy or Red-complexioned"
"Amicitia floreat"
Origin & Hubs →
Clan Heritage Co. Waterford

Foley

Ó Foghlú
Meaning: "Plunderer or Rover"
"Ut prosim"
Origin & Hubs →
G

Surnames Starting With "G"

(3 clans)
Clan Heritage Co. Donegal

Gallagher

Ó Gallchobhair
Meaning: "Lover of Foreigners or Foreign Helper"
"Mea gloria fides (Faith is my Glory)"
Origin & Hubs →
Clan Heritage Co. Mayo

Gavin

Ó Ghabhann
Meaning: "Hawk of Battle"
"Malo mori quam foedari"
Origin & Hubs →
Clan Heritage Co. Clare

Griffin

Ó Gríobhtha
Meaning: "Griffin-like or Fierce"
"Fide et fortitudine"
Origin & Hubs →
H

Surnames Starting With "H"

(5 clans)
Clan Heritage Co. Cork

Hayes

Ó hAodha
Meaning: "Descendant of Fire (Aodh)"
"Nil desperandum"
Origin & Hubs →
Clan Heritage Co. Cork

Healy

Ó hÉalaighthe
Meaning: "Ingenious or Artistic"
"Virtute et labore"
Origin & Hubs →
Clan Heritage Co. Clare

Hickey

Ó hÍcidhe
Meaning: "The Healer or Physician"
"Sola veritas vicit"
Origin & Hubs →
Clan Heritage Co. Mayo

Higgins

Ó hUiginn
Meaning: "Viking or Poet-Traveller"
"Pro patria"
Origin & Hubs →
Clan Heritage Co. Tipperary

Hogan

Ó hÓgáin
Meaning: "Youthful"
"Fuimus"
Origin & Hubs →
J

Surnames Starting With "J"

(1 clans)
Clan Heritage Co. Antrim

Johnston

Mac Seáin
Meaning: "Son of John"
"Nunquam non paratus"
Origin & Hubs →
K

Surnames Starting With "K"

(5 clans)
Clan Heritage Co. Galway

Keane

Ó Catháin
Meaning: "Battle or Warrior"
"Felis demulcta mitis"
Origin & Hubs →
Clan Heritage Co. Cork

Kearney

Ó Cearnaigh
Meaning: "Victorious"
"Sustine et abstine"
Origin & Hubs →
Clan Heritage Co. Fermanagh

Keenan

Ó Cianáin
Meaning: "Ancient or Enduring"
"Pro fide et patria"
Origin & Hubs →
Clan Heritage Co. Galway

Kelly

Ó Ceallaigh
Meaning: "Bright-headed, War, or Contention"
"Turris fortis mihi Deus (God is my Strong Tower)"
Origin & Hubs →
Clan Heritage Co. Wexford

Kennedy

Ó Cinnéide
Meaning: "Helmet-headed or Ugly Head"
"Avise la fin (Consider the End)"
Origin & Hubs →
L

Surnames Starting With "L"

(2 clans)
Clan Heritage Co. Galway

Lynch

Ó Loingsigh
Meaning: "Mariner or Seafarer"
"Semper fidelis"
Origin & Hubs →
Clan Heritage Co. Galway

Lyons

Ó Laighin
Meaning: "Spear"
"Virtute et fidelitate"
Origin & Hubs →
M

Surnames Starting With "M"

(53 clans)
Clan Heritage Co. Cork

MacAuliffe

Mac Amhlaoibh
Meaning: "Son of Olaf (Norse Ancestry)"
"Virtute et labore"
Origin & Hubs →
Clan Heritage Co. Donegal

MacBride

Mac Giolla Bhríghde
Meaning: "Devotee of Saint Brigid"
"Pro fide et patria"
Origin & Hubs →
Clan Heritage Co. Armagh

MacCann

Mac Canna
Meaning: "Son of the Wolf-Cub"
"Fortis et hospitalis"
Origin & Hubs →
Clan Heritage Co. Down

MacCartan

Mac Artáin
Meaning: "Son of Little Art (Stone / Bear)"
"Fortitudine et virtute"
Origin & Hubs →
Clan Heritage Co. Antrim

MacCormick

Mac Cormaic
Meaning: "Son of the Charioteer"
"Sine timore"
Origin & Hubs →
Clan Heritage Co. Roscommon

MacDermott Roe

Mac Diarmada Rua
Meaning: "The Red-haired MacDermott"
"Honor et virtus"
Origin & Hubs →
Clan Heritage Co. Sligo

MacDonagh

Mac Donnchadha
Meaning: "Son of the Brown Lord"
"Virtute probata"
Origin & Hubs →
Clan Heritage Co. Monaghan

MacEntee

Mac an tSaoi
Meaning: "Son of the Scholar"
"Scientia et labor"
Origin & Hubs →
Clan Heritage Co. Donegal

MacGettigan

Mac Eiteagáin
Meaning: "Son of the Winged One"
"Sub cruce salus"
Origin & Hubs →
Clan Heritage Co. Kerry

MacGillicuddy

Mac Giolla Mochuda
Meaning: "Follower of Saint Mochuda"
"Sursum corda"
Origin & Hubs →
Clan Heritage Co. Cavan

MacGovern

Mag Shamhradháin
Meaning: "Son of the Summer-Lover"
"Vincit veritas"
Origin & Hubs →
Clan Heritage Co. Fermanagh

MacGuire

Mag Uidhir
Meaning: "Pale Chieftain"
"Justitia et fortitudo"
Origin & Hubs →
Clan Heritage Co. Galway

MacHugh

Mac Aodha
Meaning: "Son of Fire"
"In fide et bello fortis"
Origin & Hubs →
Clan Heritage Co. Clare

MacInerney

Mac an Oirchinnigh
Meaning: "Son of the Erenagh (Church Steward)"
"Virtus in arduis"
Origin & Hubs →
Clan Heritage Co. Sligo

MacIntyre

Mac an tSaoir
Meaning: "Son of the Carpenter"
"Per ardua"
Origin & Hubs →
Clan Heritage Co. Monaghan

MacKenna

Mac Cionaodha
Meaning: "Born of Fire"
"Sub cruce vincam"
Origin & Hubs →
Clan Heritage Co. Wicklow

MacKeogh

Mac Eochaidh
Meaning: "Son of the Horseman"
"Sola virtus nobilitat"
Origin & Hubs →
Clan Heritage Co. Derry

MacLoughlin

Mac Lochlainn
Meaning: "Son of the Northman"
"Fortis et fidus"
Origin & Hubs →
Clan Heritage Co. Monaghan

MacMahon

Mac Mathghamhna
Meaning: "Son of Bear"
"Sic nos sic sacra tuemur"
Origin & Hubs →
Clan Heritage Co. Fermanagh

MacManus

Mac Mághnais
Meaning: "Son of Magnus the Great"
"Cor et manus"
Origin & Hubs →
Clan Heritage Co. Wexford

MacMorrough

Mac Murchadha
Meaning: "Son of the Sea-Battler"
"Fortis in armis"
Origin & Hubs →
Clan Heritage Co. Mayo

MacNally

Mac An Fhailghigh
Meaning: "Son of the Poor Man"
"Fidei coticula crux"
Origin & Hubs →
Clan Heritage Co. Antrim

MacNeill

Mac Néill
Meaning: "Son of Niall (Champion)"
"Vincere aut mori"
Origin & Hubs →
Clan Heritage Co. Donegal

MacNulty

Mac an Ultaigh
Meaning: "Son of the Ulsterman"
"Pro fide et patria"
Origin & Hubs →
Clan Heritage Co. Leitrim

MacPartland

Mac Pharthaláin
Meaning: "Son of Bartholomew"
"Spes mea in Deo"
Origin & Hubs →
Clan Heritage Co. Down

MacPoland

Mac Phóil
Meaning: "Son of Paul"
"Veritas vincit"
Origin & Hubs →
Clan Heritage Co. Antrim

MacQuillan

Mac Uighilín
Meaning: "Son of Little Hughe"
"Vince aut morere"
Origin & Hubs →
Clan Heritage Co. Tyrone

MacRory

Mac Ruaidhrí
Meaning: "Son of the Red King"
"Victoria veritas"
Origin & Hubs →
Clan Heritage Co. Derry

MacShane

Mac Seáin
Meaning: "Son of John"
"Vincit amor patriae"
Origin & Hubs →
Clan Heritage Co. Cavan

MacTiernan

Mac Tighearnáin
Meaning: "Son of the Little Lord"
"Virtute et labore"
Origin & Hubs →
Clan Heritage Co. Galway

Madden

Ó Madaidheáin
Meaning: "Little Hound"
"Christo duce vincamus"
Origin & Hubs →
Clan Heritage Co. Fermanagh

Maguire

Mag Uidhir
Meaning: "Dun-colored Chief"
"Justitia et fortitudo invincibilia sunt"
Origin & Hubs →
Clan Heritage Co. Cork

Mahoney

Ó Mathghamhna
Meaning: "Bear-like"
"Lasair romham agus buadh am dhiaigh"
Origin & Hubs →
Clan Heritage Co. Mayo

Mangan

Ó Mongáin
Meaning: "Having Long Thick Hair"
"Virtute non sanguine"
Origin & Hubs →
Clan Heritage Co. Cavan

McCabe

Mac Cába
Meaning: "Son of the Cap / Helmet"
"Aut vincere aut mori"
Origin & Hubs →
Clan Heritage Co. Cork

McCarthy

Mac Cárthaigh
Meaning: "Son of the Loving One"
"Forti et fideli nihil difficile (To the brave and faithful, nothing is difficult)"
Origin & Hubs →
Clan Heritage Co. Roscommon

McCormack

Mac Cormaic
Meaning: "Son of Cormac"
"Sine timore"
Origin & Hubs →
Clan Heritage Co. Roscommon

McDermott

Mac Diarmada
Meaning: "Son of Free Man"
"Honor probataque virtus"
Origin & Hubs →
Clan Heritage Co. Tipperary

McGrath

Mac Craith
Meaning: "Son of Grace"
"Salus in fide"
Origin & Hubs →
Clan Heritage Co. Clare

McNamara

Mac Conmara
Meaning: "Hound of the Sea"
"Firmitas in coelo"
Origin & Hubs →
Clan Heritage Co. Tyrone

McSorley

Mac Somhairle
Meaning: "Summer Wanderer (Viking)"
"Spernit pericula virtus"
Origin & Hubs →
Clan Heritage Co. Monaghan

Meegan

Mac Aodhagáin
Meaning: "Little Fire"
"Fortis in arduis"
Origin & Hubs →
Clan Heritage Co. Clare

Meehan

Ó Miadhacháin
Meaning: "Noble and Honorable"
"Semper fidelis"
Origin & Hubs →
Clan Heritage Co. Sligo

Milligan

Ó Maolagáin
Meaning: "Little Devotee"
"Regi et patriae"
Origin & Hubs →
Clan Heritage Co. Clare

Minogue

Ó Muineóig
Meaning: "Little Monk"
"Virtus sola nobilitas"
Origin & Hubs →
Clan Heritage Co. Mayo

Moffatt

de Mofa
Meaning: "Long Field (Hiberno-Norman)"
"Spero meliora"
Origin & Hubs →
Clan Heritage Co. Galway

Monahan

Ó Manacháin
Meaning: "Descendant of the Monk"
"Semper paratus"
Origin & Hubs →
Clan Heritage Co. Laois

Moore

Ó Mórdha
Meaning: "Stately, Proud, or Great"
"Fortis cadere cedere non potest"
Origin & Hubs →
Clan Heritage Co. Mayo

Moran

Ó Móráin
Meaning: "Great or Chief"
"Lucent in tenebris"
Origin & Hubs →
Clan Heritage Co. Fermanagh

Muldoon

Ó Maoldúin
Meaning: "Chieftain of the Fort"
"Pro fide et patria"
Origin & Hubs →
Clan Heritage Co. Galway

Mullarkey

Ó Maoilearca
Meaning: "Servant of Saint Earc"
"Sub cruce salus"
Origin & Hubs →
Clan Heritage Co. Cork

Murphy

Ó Murchadha
Meaning: "Sea-battler or Sea-warrior"
"Fortis et hospitalis (Brave and Hospitable)"
Origin & Hubs →
Clan Heritage Co. Roscommon

Murray

Ó Muireadhaigh
Meaning: "Lord, Master, or Mariner"
"Tout prest"
Origin & Hubs →
N

Surnames Starting With "N"

(4 clans)
Clan Heritage Co. Cork

Nagle

de Nógla
Meaning: "Of Angulo (Norman Clan)"
"Non vox sed votum"
Origin & Hubs →
Clan Heritage Co. Antrim

Neeson

Mac Aonghusa
Meaning: "Son of Angus (One Strength)"
"Fortis et fidelis"
Origin & Hubs →
Clan Heritage Co. Carlow

Nolan

Ó Nualláin
Meaning: "Noble or Shouting Herald"
"Cor unum via una"
Origin & Hubs →
Clan Heritage Co. Cork

Noonan

Ó hIonmhaineáin
Meaning: "The Beloved Little One"
"Fidei coticula crux"
Origin & Hubs →
O

Surnames Starting With "O"

(81 clans)
Clan Heritage Co. Roscommon

O'Beirne

Ó Beirn
Meaning: "Bear or Chieftain"
"Fuimus et erimus"
Origin & Hubs →
Clan Heritage Co. Donegal

O'Boyce

Ó Buadhaigh
Meaning: "The Victorious"
"Buadh no bas"
Origin & Hubs →
Clan Heritage Co. Clare

O'Brien

Ó Briain
Meaning: "Noble or Exalted"
"Lamh Laidir An Uachtar (The Strong Hand Uppermost)"
Origin & Hubs →
Clan Heritage Co. Galway

O'Broder

Ó Bróthair
Meaning: "Brother or Kin"
"Vincit amor patriae"
Origin & Hubs →
Clan Heritage Co. Kildare

O'Carey

Ó Ciardha
Meaning: "Dark or Black-haired"
"Sine macula"
Origin & Hubs →
Clan Heritage Co. Dublin

O'Casey

Ó Cathasaigh
Meaning: "Brave or Watchful"
"Vigila et ora"
Origin & Hubs →
Clan Heritage Co. Donegal

O'Clery

Ó Cléirigh
Meaning: "The Scholar-Historian"
"Ex virtute honor"
Origin & Hubs →
Clan Heritage Co. Derry

O'Coigley

Ó Coigligh
Meaning: "Fierce in Battle"
"Virtus in arduis"
Origin & Hubs →
Clan Heritage Co. Kerry

O'Connell

Ó Conaill
Meaning: "Strong as a Wolf"
"Ciall agus neart (Wisdom and Strength)"
Origin & Hubs →
Clan Heritage Co. Roscommon

O'Connor

Ó Conchobhair
Meaning: "Lover of Hounds or High Chieftain"
"O Dia gach anoir (From God all Honor)"
Origin & Hubs →
Clan Heritage Co. Offaly

O'Coughlan

Ó Cochláin
Meaning: "Cloaked Chieftain"
"Fide et amore"
Origin & Hubs →
Clan Heritage Co. Clare

O'Dea

Ó Deághaidh
Meaning: "Good or Auspicious Chieftain"
"Gleac an uachtar"
Origin & Hubs →
Clan Heritage Co. Offaly

O'Dempsey

Ó Díomasaigh
Meaning: "Proud or Haughty"
"Elatum sublevat Deus"
Origin & Hubs →
Clan Heritage Co. Cork

O'Dineen

Ó Duinnín
Meaning: "Historian or Scholar"
"Virtute decet non sanguine niti"
Origin & Hubs →
Clan Heritage Co. Donegal

O'Donnell

Ó Domhnaill
Meaning: "World Ruler"
"In hoc signo vinces"
Origin & Hubs →
Clan Heritage Co. Kerry

O'Donoghue

Ó Donnchadha
Meaning: "Brown-haired Lord"
"Nunquam victus"
Origin & Hubs →
Clan Heritage Co. Offaly

O'Doolan

Ó Dúláin
Meaning: "Defiant or Brave"
"Fortis et fidelis"
Origin & Hubs →
Clan Heritage Co. Wexford

O'Doran

Ó Deoráin
Meaning: "The Exile or Pilgrim"
"Spes mea in Deo"
Origin & Hubs →
Clan Heritage Co. Sligo

O'Dowd

Ó Dubhda
Meaning: "Dark-complexioned Chieftain"
"Virtus ipsa suis firmissima nititur armis"
Origin & Hubs →
Clan Heritage Co. Laois

O'Dowling

Ó Dúnlaing
Meaning: "Chieftain of the Fort"
"Tibi soli"
Origin & Hubs →
Clan Heritage Co. Cork

O'Driscoll

Ó hEidirsceoil
Meaning: "Messenger or Interpreter"
"Invictus maneo"
Origin & Hubs →
Clan Heritage Co. Tipperary

O'Dwyer

Ó Dubhuir
Meaning: "Dark Chieftain"
"Virtus sola nobilitat"
Origin & Hubs →
Clan Heritage Co. Galway

O'Fahy

Ó Fathaigh
Meaning: "Green Plain or Field"
"Pro patria"
Origin & Hubs →
Clan Heritage Co. Roscommon

O'Fallon

Ó Fallamhain
Meaning: "Leader or Governor"
"Audaces juvat"
Origin & Hubs →
Clan Heritage Co. Galway

O'Flaherty

Ó Flaithbheartaigh
Meaning: "Bright Ruler"
"Fortuna favet fortibus"
Origin & Hubs →
Clan Heritage Co. Tipperary

O'Fogarty

Ó Fógartaigh
Meaning: "Proclaimed or Banished One"
"In utroque fidelis"
Origin & Hubs →
Clan Heritage Co. Sligo

O'Gara

Ó Gadhra
Meaning: "Mastiff or Fierce Hound"
"Fortis et hospitalis"
Origin & Hubs →
Clan Heritage Co. Clare

O'Gorman

Ó Gormáin
Meaning: "Noble and Blue-Eyed"
"Primi et ultimi in bello"
Origin & Hubs →
Clan Heritage Co. Tyrone

O'Gormley

Ó Gairmleadhaigh
Meaning: "Illustrious Leader"
"Vincit qui patitur"
Origin & Hubs →
Clan Heritage Co. Clare

O'Grady

Ó Grádaigh
Meaning: "Noble or Illustrious"
"Vulneratus non victus"
Origin & Hubs →
Clan Heritage Co. Tyrone

O'Hagan

Ó hÁgáin
Meaning: "Young Warrior"
"Vincere aut mori"
Origin & Hubs →
Clan Heritage Co. Mayo

O'Hale

Mac Héil
Meaning: "Son of Howell (Celtic Chieftain)"
"Sola virtus nobilitat"
Origin & Hubs →
Clan Heritage Co. Galway

O'Halloran

Ó hAllmhuráin
Meaning: "Pirate or Stranger from Beyond the Sea"
"Clarior e tenebris"
Origin & Hubs →
Clan Heritage Co. Armagh

O'Hanlon

Ó hAnluain
Meaning: "Great Champion"
"Sunt mihi sidera testes"
Origin & Hubs →
Clan Heritage Co. Down

O'Hanna

Ó hAnnaidh
Meaning: "Graceful Chieftain"
"Per ardua ad alta"
Origin & Hubs →
Clan Heritage Co. Cork

O'Hannon

Ó hAnnáin
Meaning: "Champion of the Tribe"
"Vincit veritas"
Origin & Hubs →
Clan Heritage Co. Sligo

O'Hara

Ó hEaghra
Meaning: "Descendant of Eaghra"
"Virtute et claritate"
Origin & Hubs →
Clan Heritage Co. Armagh

O'Hare

Ó hÍr
Meaning: "Angry or Fierce"
"Pro aris et focis"
Origin & Hubs →
Clan Heritage Co. Sligo

O'Hart

Ó hAirt
Meaning: "Bear or Hero"
"Fortiter et fideliter"
Origin & Hubs →
Clan Heritage Co. Limerick

O'Hartigan

Ó hArtagáin
Meaning: "Descendant of Little Art"
"Virtus in arduis"
Origin & Hubs →
Clan Heritage Co. Cork

O'Hea

Ó hAodha
Meaning: "Fire-Born Chieftain"
"Spes mea in Deo"
Origin & Hubs →
Clan Heritage Co. Cork

O'Hennessy

Ó hAonghusa
Meaning: "One Strength or Unique Force"
"Vi vivo et armis"
Origin & Hubs →
Clan Heritage Co. Cork

O'Herlihy

Ó hIarfhlatha
Meaning: "Lord of the West"
"Virtute et fidelitate"
Origin & Hubs →
Clan Heritage Co. Kilkenny

O'Holohan

Ó hUallacháin
Meaning: "Proud or Noble"
"Pro Deo et patria"
Origin & Hubs →
Clan Heritage Co. Cork

O'Horgan

Ó hArgáin
Meaning: "Champion or Noble Warrior"
"Virtute et fidelitate"
Origin & Hubs →
Clan Heritage Co. Limerick

O'Houlihan

Ó hUallacháin
Meaning: "Proud Hero (Kathleen Ni Houlihan)"
"Patria cara carior libertas"
Origin & Hubs →
Clan Heritage Co. Clare

O'Hurley

Ó hUrthuile
Meaning: "Sea Tide Chieftain"
"Victoria veritas"
Origin & Hubs →
Clan Heritage Co. Derry

O'Kane

Ó Catháin
Meaning: "Son of Battle"
"Felis demulcta mitis"
Origin & Hubs →
Clan Heritage Co. Cork

O'Keefe

Ó Caoimh
Meaning: "Gentle or Noble"
"Forti et fideli nihil difficile"
Origin & Hubs →
Clan Heritage Co. Wexford

O'Kinsella

Cinnsealach
Meaning: "Dominant or Supreme"
"Deo et regi fidelis"
Origin & Hubs →
Clan Heritage Co. Laois

O'Lalor

Ó Leathlobhair
Meaning: "Half-Leper or Resilient Healer"
"Fortis et fidelis"
Origin & Hubs →
Clan Heritage Co. Cork

O'Leary

Ó Laoghaire
Meaning: "Keeper of Calves"
"Laidir ar lamh uachtar"
Origin & Hubs →
Clan Heritage Co. Galway

O'Lennon

Ó Leannáin
Meaning: "Lover or Cloaked One"
"Prisco stirpe hibernico"
Origin & Hubs →
Clan Heritage Co. Clare

O'Loughlin

Ó Lochlainn
Meaning: "Norseman or Viking"
"Anchor fast anchor"
Origin & Hubs →
Clan Heritage Co. Down

O'Lowry

Ó Labhradha
Meaning: "The Spokesman or Herald"
"Virtus semper viridis"
Origin & Hubs →
Clan Heritage Co. Clare

O'Madigan

Ó Madagáin
Meaning: "Little Fierce Mastiff"
"Honor et virtus"
Origin & Hubs →
Clan Heritage Co. Antrim

O'Magee

Mac Aodha
Meaning: "Son of Fire"
"Fac et spera"
Origin & Hubs →
Clan Heritage Co. Mayo

O'Malley

Ó Máille
Meaning: "Graceful Chieftain"
"Terra marique potens (Powerful on land and sea)"
Origin & Hubs →
Clan Heritage Co. Tipperary

O'Meara

Ó Meadhra
Meaning: "Merry or Mirthful"
"Opus reipublicae decus"
Origin & Hubs →
Clan Heritage Co. Offaly

O'Molloy

Ó Maolmhuaidh
Meaning: "Noble and Steadfast Chieftain"
"Malo mori quam foedari"
Origin & Hubs →
Clan Heritage Co. Kerry

O'Moriarty

Ó Muircheartaigh
Meaning: "Navigator of the Oceans"
"Audeo"
Origin & Hubs →
Clan Heritage Co. Waterford

O'Morrissey

Ó Muirgheasa
Meaning: "Choice of the Sea"
"Virtute et labore"
Origin & Hubs →
Clan Heritage Co. Tipperary

O'Mulcahy

Ó Maolchathaigh
Meaning: "Devotee of Battle"
"Virtute et prudentia"
Origin & Hubs →
Clan Heritage Co. Donegal

O'Mulligan

Ó Maolagáin
Meaning: "Bald or Tonsured Follower"
"Regi et patriae fidelis"
Origin & Hubs →
Clan Heritage Co. Tyrone

O'Neill

Ó Néill
Meaning: "Champion or Passionate"
"Lamh Dhearg Eireann (Red Hand of Ireland)"
Origin & Hubs →
Clan Heritage Co. Waterford

O'Phelan

Ó Faoláin
Meaning: "Wolf or Little Wolf"
"Semper fidelis"
Origin & Hubs →
Clan Heritage Co. Mayo

O'Prendergast

de Priondragás
Meaning: "From Prendergast (Cambro-Norman)"
"Vincit veritas"
Origin & Hubs →
Clan Heritage Co. Derry

O'Quigley

Ó Coigligh
Meaning: "Untidy Hair or Fierce Warrior"
"Virtus in arduis"
Origin & Hubs →
Clan Heritage Co. Donegal

O'Rafferty

Ó Rabhartaigh
Meaning: "Full Tide or Prosperous"
"Fide et virtute"
Origin & Hubs →
Clan Heritage Co. Kerry

O'Rahilly

Ó Rathaille
Meaning: "Brave Warrior"
"Honor et virtus"
Origin & Hubs →
Clan Heritage Co. Cork

O'Reardon

Ó Ríordáin
Meaning: "Royal Bard or Royal Poet"
"Pro Deo et patria"
Origin & Hubs →
Clan Heritage Co. Cork

O'Riordan

Ó Ríordáin
Meaning: "Royal Bard"
"Victrix fortunae sapientia"
Origin & Hubs →
Clan Heritage Co. Leitrim

O'Rourke

Ó Ruairc
Meaning: "Mighty Chieftain"
"Buadh no bas"
Origin & Hubs →
Clan Heritage Co. Sligo

O'Scanlan

Ó Scannláin
Meaning: "Little Trap or Snare"
"Conamine augeor"
Origin & Hubs →
Clan Heritage Co. Clare

O'Shanahan

Ó Seanacháin
Meaning: "Wise Old Man"
"Virtute duce"
Origin & Hubs →
Clan Heritage Co. Galway

O'Shaughnessy

Ó Seachnasaigh
Meaning: "Elusive or Vigilant"
"Fortis et fidelis"
Origin & Hubs →
Clan Heritage Co. Kerry

O'Sheehy

Mac Síthigh
Meaning: "Peace-Loving Warrior"
"Cassis tutissima virtus"
Origin & Hubs →
Clan Heritage Co. Donegal

O'Shields

Ó Siadhail
Meaning: "Slender or Winged"
"Spero in Deo"
Origin & Hubs →
Clan Heritage Co. Mayo

O'Tierney

Ó Tiarnaigh
Meaning: "Lord or Master"
"Justitia et virtus"
Origin & Hubs →
Clan Heritage Co. Wicklow

O'Toole

Ó Tuathail
Meaning: "Mighty Ruler of the Tribe"
"Virtute et fidelitate"
Origin & Hubs →
Clan Heritage Co. Galway

O'Treacy

Ó Treasaigh
Meaning: "Warlike or Strong"
"Vincit amor patriae"
Origin & Hubs →
Q

Surnames Starting With "Q"

(1 clans)
Clan Heritage Co. Tyrone

Quinn

Ó Cuinn
Meaning: "Chief or Counsel"
"Quae sursum volo videre"
Origin & Hubs →
R

Surnames Starting With "R"

(3 clans)
Clan Heritage Co. Cork

Regan

Ó Riagáin
Meaning: "Royal or Kingly"
"Surgit post nubila phoebus"
Origin & Hubs →
Clan Heritage Co. Down

Rooney

Ó Maolruanaidh
Meaning: "Descendant of the Red-haired Hero"
"Virtute et claritate"
Origin & Hubs →
Clan Heritage Co. Tipperary

Ryan

Ó Maoilriain
Meaning: "King or Little King"
"Malo mori quam foedari (Death rather than Dishonor)"
Origin & Hubs →
S

Surnames Starting With "S"

(6 clans)
Clan Heritage Co. Kerry

Shea

Ó Séaghdha
Meaning: "Hawk-like or Majestic"
"Vincit veritas"
Origin & Hubs →
Clan Heritage Co. Cork

Sheehan

Ó Síodhacháin
Meaning: "Peaceful"
"Pax in virtute"
Origin & Hubs →
Clan Heritage Co. Cavan

Sheridan

Ó Sirideáin
Meaning: "Seeker or Searcher"
"Cervus lacessitus leo"
Origin & Hubs →
Clan Heritage Co. Cavan

Smith

Mac Gabhann
Meaning: "Son of the Blacksmith (McGowan)"
"Tenebras expellit et hostes"
Origin & Hubs →
Clan Heritage Co. Cork

Sullivan

Ó Súilleabháin
Meaning: "Hawk-eyed or Dark-eyed"
"Lamh Foisteanach An Uachtar (The Steady Hand Uppermost)"
Origin & Hubs →
Clan Heritage Co. Donegal

Sweeney

Mac Suibhne
Meaning: "Pleasant Chieftain"
"Fortitudine et fide"
Origin & Hubs →
W

Surnames Starting With "W"

(2 clans)
Clan Heritage Co. Mayo

Walsh

Breathnach
Meaning: "The Welshman or Briton"
"Transfixus sed non mortuus (Pierced but not dead)"
Origin & Hubs →
Clan Heritage Co. Galway

Ward

Mac an Bhaird
Meaning: "Son of the Bard"
"Sub cruce salus"
Origin & Hubs →