Ó Laithbheartaigh
Ó LAITHBHEARTAIGH—I—O Laffertie, O Laghertie, O Laherty, O'Lafferty, O'Laverty, Lafferty, Laverty, Laherty; 'descendant of Flaithbheartach'; a variant of Ó Flaithbheartaigh, owing to the aspiration of the initial f; the name of a distinguished family of the Cinel Eoghain in Ulster, where it is still common, especially in Tyrone, Derry, Antrim and Donegal.
Alphabetical Index to Irish Surnames