| 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. |
| Doughan | rare: N Tipperary. Ir. Ó Dubhchon, black hound. See Doohan. |
| Ó Duacháin | Doohan: líon beag: Tír Chonaill & an Clár. Sloinne Ultach - is cosúil go mbaineann an dream sa Chlár le Ó Dubhchon, q.v. Ón ainm Dubhthach a bhí coitianta fadó. GPN. |
| Ó Dubhchon | Doohan, Doughan: líon beag: an Clár, Tiobraid Árann, Tír Chonaill. Clann a bhain le Corca Laoidhe, tráth. Baineann an dream ó thuaidh le Ó Duacháin, q.v. Tá an bhrí soiléir, dar ndó, dubh + cú. SI &MIF. |
Parishes where Doohan and a second surname are found together
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