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Last name origins & meanings:

  1. German and Dutch: from Old Low German or Middle Dutch abt ‘abbot’, hence an occupational name for a servant of an abbot or a nickname for someone thought to resemble an abbot in some way. In some instances it may have been from a house name.
  2. Jewish (central Ashkenazic): from Abt, the German name of Opatów in Poland, or from Apt, the Yiddish name of this city.