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| Granaghan | fairly rare: Mayo. Ir. Mag Reannacháin, reannach = sharp-pointed. In Donegal, its place of origin, it occurs as McGranaghan, q.v. SI & SGG. |
| MacGranaghan | Quite numerous: Tyrone-Donegal, Mayo etc. Ir. Mag Reannacháin, reannach, sharp-pointed. A sept of Donegal. SI & SGG. |
| MacGrenaghan | rare: Tyrone-Donegal. See Mac Granaghan. |
| Mag Reannacháin | Mac Granaghan: líon beag: Tír Eoghain-Tír Chonaill, Maigh Eo. Clann a d'áitigh an ceantar Midhbheach, Tír Chonaill. |
Parishes where a Granahan and a second surname married each other.
This list shows total Granahan Roman Catholic marriages by county.
Click on the county to see detail.