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| Ginn | Quite numerous: Ulster. Ir. Mag Fhinn. See Maginn. |
| MacGinn | numerous: Ulster generally, Louth, Longford etc. Ir. Mag Fhinn, "son of Fionn", first name meaning "fair" or "blond". Also as Maginn. |
| Mag Fhinn | Maginn, Mac Ging: líonmhar: MacGinn i dTír Eoghain; Maginn sa Dún; Mac Ging (líon beag) i Maigh Eo & Tír Conaill. Bhíodar suite in Ó Nialláin (Ard Macha) sa 17 céad. Seans gur teifigh Ultacha an dream i Maigh Eo. MIF. |
| Maginn | fairly numerous: Belfast-Down etc. Ir. Mac Fhinn. See Mac Ginn. |
| Miggin | rare: Meath-Kildare. |
Parishes where Miggin and a second surname are both baptised.