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Last name Losch (Losch , Лош , לוש ) , around the globe, is quite a rare surname. The cognomen Losch is characteristic of Western Europe, particularly Luxembourg, where it is quite a common surname, Germany, where it is quite a rare surname, and Switzerland. In absolute terms, it most frequently occurs in Germany, the United States, and Brazil. Much less frequently, Losch is the forename as well as the last name.