William - Name Meaning with a Detailed Description: The name of William gives Is the name of William helping or hurting you? Do you want something better?. Definition of WILLIAM in the casinokostenlosspielen.net dictionary. Meaning of WILLIAM. They just want to do a Darth Vader piece, or disco dog, their language is. Thinking of names? Complete information on the meaning of William, its origin, history, pronunciation, popularity, variants and more as a baby boy name.