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Last name origins & meanings:

1. German (Köstner) occupational name from the Bavarian, Franconian dialect word Köstner ‘granary administrator’, ‘treasurer’.
2. German (Köstner): habitational name for someone from either of two places: Kösten near Bamberg, or Köstenberg.
3. German: topographic name for someone living on a ‘shelf’ in the mountains, from Latin costa ‘rib’, ‘side’, ‘flank’.