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Last name origins & meanings:

  1. German: from a short form of any of various medieval personal names derived from Germanic personal names ending in -n + wald ‘rule’, for example Arnold and Reinwald.
  2. South German: nickname for a rotund or naive person, from Middle High German nol ‘hillock’, ‘knoll’.
  3. Jewish (Ashkenazic): of uncertain origin; perhaps an occupational name from Yiddish nol ‘awl’.