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Last name origins & meanings:

  1. Hungarian (Kádár) and Slovak (Kadár): occupational name for a cooper, from Hungarian kádár, a Slavic loanword.
  2. Hungarian: from a personal name in Hun mythology. In 19th-century Hungarian romantic literature this was taken as a common noun meaning ‘judge’ or ‘chieftain’, from the time of the Magyar conquest of the Carpathian Basin.
  3. Jewish: in some cases an adoption of the Hungarian name; in others a variant of Kader.