Meaning A boy's name of Swedish origin, it means "divine wisdom." Origin of Guillelmus Swedish , Scandinavian +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Guillelmus Similar Names Goran Gorin Kalle Kjell Kristofer Patrik Eugen Jonam Maklolm Roald Year by Year Popularity of Guillelmus