| Duff | numerous: Antrim, Down, Dublin etc. Ir. Ó Duibh, dubh, black. Also an abbreviation of Duffin, MacElduff, Duffy. SI &MIF. |
| Mac Duibh | Mac Duff: annamh: Doire: Albanach. Ach ní raibh sé ann aimsir Mhac Beth Rí! |
| MacDuff | rare: Derry. Ir. Mac Duibh, dubh, dark - a dark-haired person or perhaps an abbreviation of some name beginning with dubh. The name did not exist in Mac Beth's time, but it is primarily Scottish. SS. |
| Ó Duibh | Duff, Black: líonmhar i gCúige Uladh. Is cosúil gur giorrú é ar Ó Duibhinn (Duffin) agus fiú Mac Giolla Dhuibh (Mac Elduff), ach luann de Bhulbh iad mar chlann a bhí suite in aice le Port Laoise. Féach Ó Dubhuidhe. Dar ndó, d'fhéadfadh an sloinne a theacht go díreach ó bhua-aidiacht, cosúil le bán, crón, glas, liath & rl. MIF. |
Parishes where Duffe and a second surname are found together
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