Late Latin name meaning "great". It was borne by 7th-century saint who was a missionary in Germany. It became popular in Scandinavia after the time of the 11th-century Norwegian king Magnus I, who was said to have been named after Charlemagne, or Carolus Magnus in Latin. The name was borne by six subsequent kings of Norway as well as three kings of Sweden. It was imported to Scotland and Ireland during the Middle Ages.