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| Giffen | Quite numerous: Antrim etc. Ir. Mag Dhuibhfinn (dark Finn). The name was current in Ulster in 17 cent. This name also exists in England & Scotland. See MacGiffin. SI & DBS. |
| MacGiffin | rare: Belfast area etc. Ir. Mac Dhuibhfinn, dubh + Fionn (dark Finn). A name associated with E Ulster. |
| Mag Dhuibhfinn | Mac Guffin, Mac Giffin: cuíosach annamh: oirthear Uladh. Brí: dubh + Fionn (ainm pearsanta). Litriú nua: Mag Dhuifinn. SI. |
Parishes where a McGiffin and a second surname married each other.
This list shows total McGiffin Roman Catholic marriages by county.
Click on the county to see detail.