Meaning Of Germanic origin, meaning 'desire' or 'helmet'. Willem is used chiefly in Dutch and German and is a variant of William. Origin of Willem German +-100%Zoom level changed to 1 Popular Middle Names Earl Pronunciation 🔊 Listen Willem WILL-em Similar Names Willy Bill Leaham Liam William-Andrew William Henry Thomas William Willam Willian Wilson Year by Year Popularity of Willem