| Antrim: | 4 | Belfast city: | 1 | Carlow: | 1 | Cork: | 2 |
| Dublin: | 8 | Dublin city: | 1 | Galway: | 24 | Kildare: | 6 |
| Kilkenny: | 1 | Mayo: | 28 | Meath: | 8 | Offaly: | 3 |
| Roscommon: | 27 | Sligo: | 10 | Westmeath: | 30 | Wicklow: | 3 |
| 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. |
| Ó Gréacháin | Grehan, Grimes, Graham: líonmhar: Lár na Tíre, Connachta. B'fhéidir gur ionann gréach agus scréach (= béic) ach ní mór a mheabhrú gur sloinne Albanach Graham i gCúige Uladh agus go mbaineann Grimes le Ó Gormaile, leis. In ndeireadh na dála, is féidir le muintir Grehan a rá gur Gréachánaigh iad gan aon agó. |
Parishes where Grehan and a second surname are found together
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