| Dwyer | numerous: Tipperary, Kilkenny, Wexford etc. Ir. Ó Dubhuidhir (Duibhir). The derivation is from dubh + Odhar, a first name meaning dun-coloured. A name famous for their part in the Resistance, they usually appear as O'Dwyer. IF,MIF & SGG. |
| Ó Duibhidhir | (O') Dwyer, Deere, Diver: an-líonmhar: Tiobraid Árann, Luimneach, Ciarraí, an Clár, Port Lairge, Cill Chainnigh, Loch Garman, Ceatharlach. Bhí an chlann sa bunaithe ag Coill na Manach, Tiobraid Árann, agus cáil orthu mar trodairí i gcoinnibh choncais na nGall. Clú síoraí, dar ndó, ag "Seán Ó Duibhir a'Ghleanna" san amhrán úd -"go lá deireadh a'tsaoil". Tá an sloinne i gCúige Uladh le Deere, Diver. Litriú nua: Ó Duibhir. IF & SGG. |
| O Duibhir | rare: scattered. Ir.Lang. See Dwyer. |
| O'Dwyer | Very numerous: all areas, especially Munster and South East. Ir. Ó Duibhir (dubh + odhar, dark brown). A sept of Tipperary, immortalised in the song "Seán Ó Duibhir a' Ghleanna". IF. |
DEDs where O'Dwyer and a second surname are found together
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