| Deehan | fairly rare: Donegal-Derry. Ir. Ó Díochon, díochú, great hound. Also as Deighan, Dickson. SI & SGG. |
| Dehaene | Very rare: Dublin. |
| Deighan | Quite numerous N Ulster. Ir. Ó Díochon, Duibhginn. The former a sept of Oriel which is more appropriate to the present location. See also Deehan. |
| Ó Díochon | Deehan, Deighan: cuíosach annamh: Doire, Tír Conaill. Deineadh Dickson de in Aontroim. Tá Ó Duibhginn ar Deighan, leis. |
Parishes where Deihan and a second surname are found together
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