|Crum||Very rare: Antrim. Scottish. SS.|
|Mac Cruim||Mac Crum, Crum: cuíosach líonmhar: an Dún & rl. Sloinne Albanach ó Ile (Islay).|
|MacCrum||fairly numerous: Down etc. Scots Gaelic Mac Cruim, crom, bent, stooped. A Scottish name associated with Islay.|
|MacCrumb||Very rare: Belfast. As Mac Crum.|
Parishes where McCrum and a second surname are found together
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