|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 Garrigan and a second surname are found together
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