numerous: Tyrone & Ulster generally, Midlands, Connacht, N Munster. Ir. Ó Gréacháin in the south, Ó Garmaile in Ulster. MacLysaght says that Ó Greidhm, used in Munster is a recent invention. The name is current in England, derived from the Old English "grim", meaning just that! It may well be represented amongst the Grimes of the eastern part of Ireland. SI, SGG & DOS.
Grimes: líon beag: Luimneach, Connacht & rl. Deir Mac Giolla Iasachta gur gaelú nua é seo - Ó Gréacháin nó an sloinne gallda an bun-rud.