MagnusyoudaoicibaDictYouDict[Magnus 词源字典]
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;" see magnate) was a personal name.[Magnus etymology, Magnus origin, 英语词源]