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Family name Шлагер (Schlager , Шлагер ) , globally, is quite a common surname. The cognomen Шлагер is characteristic of Austria, where it is quite a common surname, Germany, where it is quite a rare surname, and Costa Rica. Measured by absolute frequency, it is the most numerous in Austria, Germany, and the United States. Very seldom, Шлагер is the forename as well as the last name.