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| 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. |
Parishes where McDuff and a second surname are both baptised.
This list shows total McDuff Roman Catholic baptisms by county.
Click on the county to see detail.