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© MapTiler © OpenStreetMap contributors| Gargan | fairly numerous: Midlands etc. Ir. Ó Geargáin, gearg = fierce. Originally of Breifne and also occurring as Mac Geargáin. |
| Garrahan | rare: Roscommon-Longford. Ir. Mag Aracháin (perhaps arrachtach, monster-like). A family originating in Fermanagh and linked with Ó Faracháin (Farren). MIF & SGG. |
| Garrigan | Quite numerous: Dublin, Meath etc. Ir. Mac Geargáin; Ó Geargáin. See Gargan. |
| MacGarahan | Very rare: Tipperary. Ir. Mag Aracháin, derived, perhaps, from Farachán. See also Farren. |
Parishes where a Garigan and a second surname married each other.
This list shows total Garigan Roman Catholic marriages by county.
Click on the county to see detail.