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Surname Schlager (Schlager , Szlagier , Шлагер ) , globally, is quite a common cognomen. The cognomen Schlager is habitual in Austria, where it is quite a common surname, Germany, where it is quite a rare surname, and Costa Rica. In absolute terms, this name is the most popular in Austria, Germany, and the United States. Much less frequently, Schlager is the forename as well as the last name.