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| Grehan | numerous: Louth, Midlands, Connacht. Ir. Ó Gréacháin, gréach = scream. It has been anglicised Graham and Grimes also. SI. |
| MacGreehan | Very rare: Belfast. See Mac Grehan. |
| MacGrehan | Very rare: Down. Ir. ? Mac Gréacháin. Woulfe derives it from créach, blind. If so, it should spell Mag Créacháin. SGG. |
| Magreehan | rare: Belfast area. See Mac Grehan. |
Parishes where Magreehan and a second surname are both baptised.