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Cognomen Ader (Ader , Адер , Áder ) , across the world, is quite a common last name. The family name Ader is habitual in Estonia, where it is quite a common surname, France, where it is quite a rare surname, and Ethiopia. Not in comparison with a country's population, it most frequently occurs in Ethiopia, the United States, and France. Likewise, Ader is the forename as well as the last name.