Ó Cianaigh
Ó CIANAIGH—I—O'Keeney, Keaney, Keany, Keeney, Keeny; 'descendant of *Cianach' (derivative of Cian); or perhaps more correctly Ó Caoinnigh, 'descendant of Caoinneach' (a variant of Coinneach); in use in Galway and Donegal.
Alphabetical Index to Irish Surnames