| Gargan | fairly numerous: Midlands etc. Ir. Ó Geargáin, gearg = fierce. Originally of Breifne and also occurring as Mac Geargáin. |
| Kirgan | Very rare: Antrim. |
| Mac Ciaragáin | Mac Kergan: annamh: Aontraim. Níltear cinnte faoin leagan Gaelach seo. |
| Mac Geargáin | Garrigan: líon beag: an Mhí. Ar aon dul le Ó Geargáin. |
| MacGurgan | fairly rare: Armagh-Tyrone etc. Ir. Mac Dhuarcáin, duarcán, a gloomy person. See also Durcan and Durkin. |
| MacKergan | rare: Antrim. Ir. ? Mac Ciaragáin. See Kerrigan. |
| Ó Geargáin | Gargan: cuíosach líonmhar: Lár na Tíre. Sloinne a bhí bunaithe i mBreifne. Brí: gearg = laoch, gaiscíoch, ar bonn meafarach. |
Parishes where McKergan and a second surname are found together
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