Ó Laitheasa
Ó LAITHEASA, Ó LAITHGHEASA—I—O Lahissa, O Lassy, O Lassie, O Lasy, O Lacy, Lacy, Lacey, Leacy, (De Lacy); 'descendant of Flaitheas,' or 'Flaithgheas'; older forms Ó Flaitheasa and Ó Flaithgheasa, which see; the name of an old Wexford family, still numerous in that county. To be distinguished from the Norman de Lacy (see de Léis).
Alphabetical Index to Irish Surnames