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Last name origin & meaning:

English, Scottish, Swedish, Danish, Norwegian, German, and Dutch: from the Scandinavian personal name Magnus. This was borne by Magnus the Good (died 1047), king of Norway, who was named for the Emperor Charlemagne, Latin Carolus Magnus ‘Charles the Great’. The name spread from Norway to the eastern Scandinavian royal houses, and became popular all over Scandinavia and thence in the English Danelaw.