American Family Name Origins:
McWilliams
Frequency: (7512)
(number of times this surname appears in a sample database of 88.7 million names, representing one third of the 1997 US population)
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.
See the Key to the Dictionary or consult the General Introduction for further explanation.
