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Surname Kosch (Kosch , Кош , קוש ) , throughout the world, is quite a rare family name. The family name Kosch is characteristic of British Virgin Islands, where it is quite a common surname, Austria, where it is quite a rare surname, and Germany. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and Austria. Much less frequently, Kosch is the forename as well as the last name.