| Cowan | numerous: Down and Ulster generally, Dublin. Ir. Mac Comhdhain, Ó Comhdhain. From a rare early personal name Comhghan. Also as MacCone. However, Cowan is a common Scottish name (of similar derivation) which may account for many in Ulster. |
| Cowen | Very rare: E Ulster. See Cowan. |
| MacCowan | rare: Antrim, Kerry etc.Ir. Mac Comhdhain. There is a Scottish connection but it is in any case a synonym of Mac Cone, q.v. MIF. |
| Macowan | Very rare: Derry. Ir. Mac Comhdhain. See Mac Cone. |
Parishes where Macowan and a second surname are found together
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