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Cognomen Retard (Retard , หน่วงกระโทก, หน่วงเหนี่ยว) , around the world, is a very rare last name. The cognomen Retard is characteristic of Australia, where it is a very rare surname, France, where it is an extremely rare surname, and Canada. Measured by absolute frequency, this name is the most popular in Australia, the United States, and France. Very seldom, Retard is the forename as well as the last name.