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Cognomen Ruser (鲁泽 , Ruser , Recuso ) , in all the world, is quite a rare last name. The cognomen Ruser is habitual in Paraguay, where it is quite a rare surname, Germany, where it is a rare surname, and Switzerland. Measured by absolute frequency, it is commonest in Germany, the United States, and Paraguay. Very seldom, Ruser is the forename as well as the last name.
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