|Dowd||numerous: Ulster & N Leinster. Ir. Ó Dubhda, dubh, black, dark. A sept of the Northern Uí Fiachrach (Mayo) with branches in Kerry (Doody) and in Derry (Duddy).|
|Ó Dubhda||(1) (O)Dowd, (2) Doody, (3) Duddy: an-líonmhar (1) ar fud na tíre, Connacht, Ulaidh agus tuaisceart Laighean ach go h-áirithe, (2) Ciarraí & Luimneach, (3) Doire. An chraobh is mó, bhaineadar le Uí Fiachrach (Maigh Eo). Chuaidh cuid acu go C. Mumhan sa 16 céad. Bhain an dream ó thuaidh le Cineál Eoghain. IF & SGG.|
|O'Dowda||numerous: all areas, especially Connacht and N Munster. Ir. Ó Dubhda, from first name Dubhdach, dark. A sept of N Connacht, they appeared in Munster as Doody and in Derry as Duddy. IF.|
Parishes where O'Dowd and a second surname are found together
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