Ó Dubhdacáin
Ó DUBHDACÁIN, Ó DUBHDAGÁIN—I—O Dowdegane, O Dwdigane, Dowdican, Dudican; descendant of 'Dubhdacán' or 'Dubhdagán' (diminutive of Dubhda); a rare Sligo surname. MacFirbis mentions a family of Ó Dubhdacáin among the Cinel Eoghain.
Alphabetical Index to Irish Surnames