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.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
Start your FREE family tree. Who will you discover?
A family tree is the easiest way to start discovering your family history. To begin, just enter whatever you know and we'll use that to try and find more information for you.
Begin your family tree with your name:
Member Connections
Anonymously contact one of the Ancestry members researching the gwilliam last name.