Ó Firghil
Ó FIRGHIL—I—O Ferrill, O Phirell, O'Freel, Freel, Friel, Freal, &c.; 'descendant of Fearghal' (super-valour); a variant of Ó Fearghail, which see; the name of a family of Cinel Conaill who derive their descent from Eoghan, brother of St. Columcille, and were hereditary erenaghs of Kilmacrenan, in Co. Donegal. The name is still common in that county, but pronounced Ó Frighil, which see. O'Freel had the privilege of inaugurating O'Donnell as chieftain of Tirconnell.
Alphabetical Index to Irish Surnames