| Dever | fairly rare: Mayo. Ir. Ó, Mac Duibhidhir. Variant of Donegal name Diver, q.v. |
| Diver | fairly numerous: Donegal-Derry etc. Ir. Ó Duibhidhir.(mod. Ó Duibhir). A sept of Tír Conaill also appearing as Deere. The name is cognate with O'Dwyer in the south. SI. |
| Dyer | Quite numerous: Mayo, Belfast and scattered. An English occupational name but in Ireland usually for Mac Duibhir which commonly occurs as MacDyer. However the Dyers of Belfast may well be of English origin. |
| Mac Dubhuidhir | (Mac)Dyer, Dyar: annamh: Tír Chonaill & rl. Tá Mac Dwyer i gCabhán. Is sloinne Sasanach Dyer, chomh maith. Fréamh: an dá dhath: dubh + odhar. Litriú nua: Mac Duibhir. Féach Ó Duibhidhir, leis. MIF. |
| MacDyer | fairly rare: Donegal etc. Ir. Mac Duibhidhir, modern Duibhir (SGA). Compare Mac Dwyer. |
Parishes where Devar and a second surname are found together
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