Scottish and northern Irish: Anglicized form of Gaelic Mac
Colmáin ‘son of Colmán’ (earlier Columbán),
a diminutive of the personal name Colum. See also
Coleman, McCallum. The addition of -t is due to
English speakers’ perception of the devoicing of Gaelic final
-n.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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