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Surname Zumstein (Zumstein ) , all around the world, is quite a rare last name. The cognomen Zumstein is characteristic of Switzerland, where it is quite a common surname, Eswatini, and Belgium, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Switzerland, the United States, and Eswatini. Much less frequently, Zumstein is the forename as well as the last name.