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| Geagan | Very rare: Midlands. See Geoghagan. |
| Geaghan | Very rare: Galway. See Geoghagan. |
| Geoghegan | numerous: Midlands, S E Leinster, Connacht, Down. Ir. Mag Eochagáin, from the early personal name Eochaidh,(horseman). Important sept of the Southern Uí Néill in W Meath down to the Cromwellian confiscation, with a branch in Connacht.MIF, SGG |
| Mac Eochagáin | rare: Galway etc. Ir.Lang. See Coogan, Keogan. |
| Mac Eochagáin | leagan Ultach de Mag Eochagáin. |
| MacGothigan | rare: Antrim. |
| Mag Eochagáin | Mac Geoghegan, Geoghegan: líonmhar: Laighin & Connacht go sonrach. Clann iomráiteach san Iarmhí, craobh d'Uí Néill an Deiscirt. Ón ainm Eochaidh. IF. |
Parishes where Geoghegan and a second surname are both baptised.
This list shows total Geoghegan Roman Catholic baptisms by county.
Click on the county to see detail.