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| Dermond | rare: Donegal. Ir. Ó Duibhdhíorma, (black trooper?). Also anglicised Derby, Deyermond, Dermott. Orginated in Inishowen, Donegal. SI &MIF. |
| Deyermond | rare: Down. See Dermond, Dermott, Ir. Ó Duibhdhíorma.MIF. |
| Dorman | fairly numerous: E Ulster, Dublin, Cork. English, 17 cent. In Ulster, possibly a variant of Dornan, for which Ir. Ó Dornáin. SI. |
| Ó Duibhdhíorma | Dermond, Dermott: annamh: Tír Chonaill & oirthear Uladh. Luaitear ins na h-Annála go minic iad, nuair a bhí siad suite in Inis Eoghain. Tugadh Darby orthu níos déanaí, agus deineadh Ó Díorma díbh, leis. Fréamh: dubh + díorma (scata saighdiúirí). |
Parishes where a Dorman and a second surname married each other.