No MacGarahan households in Griffith's.
| 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. |
| Mag Garacháin | Garrahan: annamh: Ros Comáin-Longfort. Clann eaglasta i bhFear Manach, tráth. Bhí Mag Aracháin orthu annsan. |
Parishes where MacGarahan and a second surname are found together
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