Gwilliam Family History
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Gwilliam Name Meaning
Welsh: from the personal name Gwilym, Welsh form of William. The initial G- was acquired by analogy with names such as Gwyn, of which the lenited form is Wyn.
Source: Dictionary of American Family Names ©2013, Oxford University Press
Similar surnames: William, Gilliam, Gillham, Mcwilliam, Gillian, Gillem, Illian