Irish: probably a variant of McCullough, or
an Anglicized form of Gaelic Mac Duinnshléibhe (see
Dunleavy). Seán de Bhulbh notes that there was an Ulster
family called Mac Colla, though this was usually Anglicized as
Coll.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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