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Cognomen Dilger (Dilger , Дильгер ) , in the world, is quite a rare family name. The last name Dilger is habitual in Germany, where it is quite a rare surname, Ireland, and Australia, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Germany, the United States, and Australia. Very seldom, Dilger is the forename as well as the last name.