Ó Farannáin
Ó FARANNÁIN—I—O Farenane, O Ferrenan, Farnan, Farnon, Farnand, (Farnham); 'descendant of Farannán' (an ancient Irish personal name); also written Ó Forannáin, which see; the name of an ecclesiastical family in Ulster who were erenaghs of Ardstraw.
Alphabetical Index to Irish Surnames