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| Gargan | fairly numerous: Midlands etc. Ir. Ó Geargáin, gearg = fierce. Originally of Breifne and also occurring as Mac Geargáin. |
| Mac Geargáin | Garrigan: líon beag: an Mhí. Ar aon dul le Ó Geargáin. |
| Ó Geargáin | Gargan: cuíosach líonmhar: Lár na Tíre. Sloinne a bhí bunaithe i mBreifne. Brí: gearg = laoch, gaiscíoch, ar bonn meafarach. |
Parishes where Gairgan and a second surname are both baptised.