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| Diamond | numerous: Ulster generally with lesser numbers in Connacht. Ir. Ó Diamáin, dim. of personal name Díoma. This family were erenaghs of Kilrea, Derry. SGG. |
| Dimond | rare: Wexford and scattered. See Diamond. |
| Dymond | rare: Belfast etc. A variant of Diamond, q.v. |
| Ó Diamáin | Diamond: líonmhar i gCúige Uladh & Maigh Eo-Sligeach. Clann airchinneach i nDoire a b'ea iad. Préimh: Díoma - ainm ceana ar Dhiarmaid fadó. GPN. |
Parishes where a Dimond and a second surname married each other.