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| MacWhinney | fairly rare: Down etc. Ir. Mac Shuibhne (SI) i.e. equivalent of Mac Sweeney, but Black states that it is a Galloway form of Mac Kenzie, Scots Gael. Mac Coinnich. See also Mawhinney. |
| Mawhinney | numerous: Ulster generally, especially Antrim-Down. Ir. Mac Shuibhne, from first name Suibhne (pleasant), so synonymous with Mac Sweeney. It seems to be a Scottish name from Galloway, where there is some confusion with Mac Kenzie. MIF & SS. |
Parishes where Mawhiney and a second surname are both baptised.