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| MacGahan | numerous: Monaghan-Armagh-Tyrone etc. Ir. Mag Eacháin from first name Eachán, dimin. of Eochaidh. The name was associated with Oriel. SI. |
| MacGaughan | Very rare: Belfast etc. Ir. Mag Eacháin. See Mac Gahan. |
| Mag Eacháin | Mac Gahan,-on: líon beag: Ard Mhacha, Tír Eoghain, Muineachán, Lú. Clann a bhain le Oirghialla i gcónaí. Díspeagadh ar Eachaidh an t-ainm seo, is cosúil. |
| Mag Gathan | Gahan: luaite ag de Bhulbh mar chlaochlú ar Mac Gaoithín. |
| Megaughan | rare: Antrim. Ir. Mag Eacháin. See Mac Gahan. |
Parishes where McGaghan and a second surname are both baptised.
This list shows total McGaghan Roman Catholic baptisms by county.
Click on the county to see detail.