[Ir. corbbaid, defiles (?); mac, son of].
Common Irish name borne by many figures both legendary and historical, including kings, ecclesiastics, and saints. The best-known Cormacs are probably the legendary king Cormac mac Airt; the glossator of Sanas Cormaic [Cormac's Glossary], Cormac mac Cuilennáin; and Cormac mac Carthaig, for whom ‘Cormac's Chapel’ at Cashel is named. There does not appear to be one progenitor for the Irish and Scottish families named McCormick, MacCormack, etc.