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| Kilduff | Quite numerous: Offaly, Athlone area etc. Ir. Mac Giolla Dhuibh, dubh, black. Also as MacIlduff, Duff, Black. SI. |
| Mac Giolla Duibh | Mac Ilduff: líon beag i dTír Eoghain, ach Kilduff in Uíbh Fhailí agus timpeall Áth Luain. Bhí clanna (1) i mBreifne (2) in Uí Maine (Gaillimh) agus (3) i Sligeach. Bhí an sloinne seo ar fáil go forleathan i bhfus agus in Albain. Deineadh Duff agus Black de, uaireannta. |
| MacElduff | Quite numerous: Tyrone etc. Ir. Mac Giolla Dhuibh (dark servant). See also Kilduff. |
| MacIlduff | rare: Belfast area etc. Ir. Mac Giolla Duibh. (dark servant). A Cavan sept. |
Parishes where Kilduff and a second surname are both baptised.
This list shows total Kilduff Roman Catholic baptisms by county.
Click on the county to see detail.