O'Driscoll (and its derivative Driscoll) is an Irish surname stemming from the Gaelic Ó hEidirsceoil clan. The O'Driscolls were rulers of the Dáirine sept of the Corcu Loígde until the early modern period. Their ancestors were Kings of Munster until the rise of the Eóganachta in the 7th century. At the start of the 13th century, three prominent branches of the family came into existence: O'Driscoll Mor, O'Driscoll Og, and O'Driscoll Beara. The Ó prefix was dropped by many in Ireland during the 17th and 18th centuries. The surname is now most prominent in the Irish counties of Cork and Kerry.