William derives from the Germanic elements "wil" (desire, will) and "helm" (helmet, protection), literally meaning "resolute protector" or "determined guardian." The name has Germanic and Norman roots, becoming widespread throughout English-speaking and European cultures following the Norman Conquest of England in 1066 under William the Conqueror.
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Baby name data from babynamesuggestion.com. Popularity figures are Australian registry data and remain subject to the originating agencies' terms.