Meaning A boy's name of Norse origin, it means "A mythical giant." Origin of Bolthor Norse , Scandinavian +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Bolthor Similar Names Bergelmir Im Rungnir Surtr Thrym Tjasse Ymir Custennin Brokk Fafner Year by Year Popularity of Bolthor