No McGuffen households in Griffith's.
| Mac Duibhfinn | féach Mag Dhuibhfinn. |
| MacGuffin | fairly rare: Tyrone-Down etc. Ir. Mag Dhuibhfhinn. (dark Finn). Or Mag Dhuibhghinn. (dark head). See also Duffin. |
| Mag Dhuibhfinn | Mac Guffin, Mac Giffin: cuíosach annamh: oirthear Uladh. Brí: dubh + Fionn (ainm pearsanta). Litriú nua: Mag Dhuifinn. SI. |
Parishes where McGuffen and a second surname are found together
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