The mcwilliams Surname
mcwilliams Name Meaning and History
Irish: Anglicized form of Gaelic Mac Uilleim, a patronymic
from a Gaelicized form of William, with the redundant addition
of English patronymic -s. In many cases it represents a partial
Gaelicization of Welsh Williams.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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