Origins & History of the Sullivan Clan
Sullivan (and O’Sullivan) is the third most common surname in Ireland and one of the quintessential diaspora lineages in America. Derived from Ó Súilleabháin, the name translates etymologically as “one-eyed”, “hawk-eyed”, or “dark-eyed”.
The O’Sullivans belong to the royal Eóganacht Chaisil dynasty, originally reigning over the fertile plains around Cashel in County Tipperary. Following Anglo-Norman invasions in the late twelfth century, they migrated into the rugged, sea-swept mountains of West Cork and County Kerry. There they split into two primary chieftaincies: O’Sullivan Mór (the Great) on the Iveragh Peninsula and O’Sullivan Beare on the Beara Peninsula.
During the Great Famine and the subsequent copper boom, Sullivan families emigrated by the thousands to Boston, Chicago, and the copper mines of Butte, Montana. In sports, Boston-born John L. Sullivan became the idol of Irish-America as the last bare-knuckle and first gloved world heavyweight boxing champion.