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| Crumlish | rare: Donegal-Derry. Ir. Mac Cromroisc. Perhaps, "squint-eyed". |
| Ó Cromruisc | Crumlish: annamh: Tír Conaill-Doire. "fiarshúileach", b'fhéidir. Tá an leagan Mac Cromruisc scaipthe in Ulaidh, leis. |
Parishes where a Crumlish and a second surname married each other.