|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 Giffen and a second surname are found together
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