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|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 both baptised.
This list shows total Doughan Roman Catholic baptisms by county and parish.
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