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Last name origins & meanings:

  1. French: from Old French Aleman ‘German’ (Late Latin Alemannus, from a Germanic tribal name, probably meaning ‘all the men’), hence a regional or ethnic name for a German-speaker in a predominantly French-speaking area. Compare Allman.
  2. German (Allemann): from a Germanic personal name composed of the elements adal ‘noble’ + man ‘man’.