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Cognomen Kemeny (Kemény , Kemeny , Кемени) , in all the world, is quite a common family name. The cognomen Kemeny is characteristic of Eastern Europe, particularly Hungary, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Romania. Measured by absolute frequency, this name is the most popular in Hungary, the United States, and Slovakia. Much less frequently, Kemeny is the forename as well as the last name.