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Cognomen Kerner (Kerner , 克纳 , Кернер ) , in all the world, is a common last name. The cognomen Kerner is habitual in Estonia, where it is quite a common surname, Hungary, where it is quite a rare surname, and Germany. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and Hungary. Much less frequently, Kerner is the forename as well as the last name.