Ó Cianáin
Ó CIANÁIN—I—O Kinane, O Keynan, O'Keenan, Keenan, Kinnan; 'descendant of Cianán' (diminutive of Cian); the name of a literary family in Ulster, who were hereditary historians to the Maguires; still numerous in that province.
Alphabetical Index to Irish Surnames