Charlemagne

masc. proper name, from French Charles, from Medieval Latin Carolus, from Middle High German Karl, literally "man, husband" (see carl).

Scandinavian masc. proper name, popular with early kings, the first to use it was Magnus I, king of Norway and Denmark (d. 1047), who evidently took it in emulation of Charlemagne (Latin Carolus Magnus) under the impression that magnus (Latin, literally "great," from PIE root *meg- "great") was a personal name.