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Cognomen Claesson (Claesson , Классон ) , in the entire world, is quite a common surname. The cognomen Claesson is characteristic of Sweden, where it is quite a common surname, Eswatini, where it is quite a rare surname, and Denmark. Not in comparison with a country's population, it is the most numerous in Sweden, Denmark, and the United States. Very seldom, Claesson is the forename as well as the last name.