Sigmund m. Old High German sigu 'victory' + Old English mund 'protector', Old Saxon mund, Old High German munt 'hand, protection'.
The name of a 5th C prince of Burgundy, a 6th C king of Burgundy and saint, a 15th C Holy Roman emperor, a 15th C grand duke of Lithuania, two 16th C kings of Poland, and a 16th C king of Sweden.