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| Gargan | fairly numerous: Midlands etc. Ir. Ó Geargáin, gearg = fierce. Originally of Breifne and also occurring as Mac Geargáin. |
| MacGurgan | fairly rare: Armagh-Tyrone etc. Ir. Mac Dhuarcáin, duarcán, a gloomy person. See also Durcan and Durkin. |
Parishes where Magurgan and a second surname are both baptised.