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Surname meaning for Koster
Dutch and North German: status name for a sexton, Middle Dutch coster(e). Compare German Kuster. North German (Köster): occupational nickname or status name for a day laborer who owned no land, from Middle Low German koster, from kossater ‘cottager’. South German: occupational name for a wine taster, from kosten ‘to taste’. Jewish (Ashkenazic): occupational name for a grocer or provisioner, from German Koster ‘provisions’, ‘foodstuffs’ + the agent suffix -er.