Ó Céin
Ó CÉIN—I—O Keyne, O Kean, Kean, Keane; 'descendant of Cian' (an old Irish personal name); the name of a Waterford family who were anciently chiefs of a district bordering on the River Mahon. To this family belonged, according to O'Donovan, the two great tragedians, Edmund Keane and his son, Charles John Keane. Ó Céin was also the name of a Derry family. It is now very rare and its anglicised forms cannot be distinguished from those of Ó Catháin, which see.
Alphabetical Index to Irish Surnames