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French word Guillaume comes from Proto-Germanic *wiljô (Will, wish, desire.), Proto-Germanic *helmaz (Helmet.)
*wiljô (Proto-Germanic)
Will, wish, desire.
*helmaz (Proto-Germanic)
Helmet.
Willahelm (Frankish)
Willaume (Old French)
Guillaume (French)
A male given name., equivalent to English William.. A patronymic surname.