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Cognomen Куперштейн (Куперштейн , Kupershtein , Kupershteyn ) , in all the world, is a rare family name. The surname Куперштейн is characteristic of Latvia, where it is a rare surname, Israel, and Ukraine, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in the United States, Russia, and Israel.