Ó Donnghusa
Ó DONNGHUSA—I—O Dangussa, O Danaisa, O Denisi, Dennis, Denis, Denison, Dennison, Denson; 'descendant of Donnghus' (brown-choice); the name of an ecclesiastical family in Ulster; also of a Munster family, chiefly in Cork and Waterford.
Alphabetical Index to Irish Surnames