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Family name Posch (Posch , Poche , Пош ) , in all the world, is a common last name. The last name Posch is characteristic of Austria, where it is quite a common surname, the Dominican Republic, where it is quite a rare surname, and Hungary. In absolute terms, it most frequently occurs in Austria, the United States, and Germany. Very seldom, Posch is the forename as well as the last name.