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Not to be confused with McWilliams or Meic Uilleim.

MacWilliams and MacWilliam are English-language surnames. They are derived from the Gaelic Mac Uilleim, a patronymic form of a Gaelicized form of the English William. The final -s in MacWilliams is a redundant English patronymical suffix.[1]


  1. ^ MacWilliams,, retrieved 2013-11-30