| Doogan | Quite numerous: W Ulster. Ir. Ó Dubhagáin. A variant of Duggan in Ulster. |
| Doohan | Quite numerous: Donegal, Clare. Ir. Ó Duacháin, but the Clare people are probably Ó Dubhchon. See also Doughan. |
| Dougan | numerous: E Ulster etc. Ir. Ó Dubhagáin (dim. of dubh, black). See Duggan. |
| Doughan | rare: N Tipperary. Ir. Ó Dubhchon, black hound. See Doohan. |
| Dugan | Quite numerous: E Ulster. A Scottish name cognate with Dougan and Duggan, q.v. |
| Duggan | Very numerous: Munster, Connacht, Ulster. The E Ulster Duggans may be of Scottish origin, to some extent. Ir. Ó Dubhagáin, dim. of dubh, black or dark. IF & SGG. |
| Ó Dubhagáin | Duggan, Dougan: an-líonmhar: an Mhumhain, Connachta & Ulaidh. Bhí dhá chlann sa Mhumhain agus dhá cheann eile i gConnachta. B'fhéidir go mbaineann an dream in oirthear Uladh (Dougan) le h-Albain. IF. |
Parishes where Doughan and a second surname are found together
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