Cianacht
CIANACHT (Keenaght), race of Cian, son of Oilioll Olum, King of Munster in the 3rd century; the families of Ó Cearbhaill, Ó Meachair and Ó Ríoghbhardáin of Eile, Ó Cathasaigh of Breagh, Ó Conchobhair of Glen Geimhin, and Ó hEaghra and Ó Gadhra of Luighne in Connacht.
Alphabetical Index to Irish Surnames