Ó Donndubhartaigh
Ó DONNDUBHARTAIGH—I—O Donnoartie, O Donorty, O Dunort, Donarty, Donworth, Dunworth, Dunfort, Dunford, (Davenport); 'descendant of Donndubhartach,' (brown Dubhartach); an old Munster surname, still well represented in the province. It appears to have originated in the neighbourhood of Clonmel.
Alphabetical Index to Irish Surnames