The mcwilliam Surname
mcwilliam Name Meaning and History
- Scottish and northern Irish: Anglicized form of Gaelic Mac Uilleim, a patronymic from a Gaelicized form of William, frequently Anglicized as Williamson.
- Northern Irish: variant of McQuillan.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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