Ó Fiachna
Ó FIACHNA, Ó FIACHNACH—I—O Fiaghny, O Fieghny, O Feoghny, Feighney, Feeheny, Feoghney, Feghany, Faheney, (Fenton), and, by 'translation,' Hunt; 'descendant of 'Fiachna' (an ancient Irish personal name); the name of a family of Sil-Murray in Co. Roscommon; now also in Cork, Limerick and Tipperary. It is 'translated' Hunt, in parts of Sligo, and changed to Fenton in parts of Munster.
Alphabetical Index to Irish Surnames