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Last name Karlson (Karlson , カールソン , Карлсон ) , across the world, is quite a rare cognomen. The surname Karlson is characteristic of Northern Europe, particularly Estonia, where it is quite a common surname, Sweden, where it is quite a rare surname, and Norway. Not in comparison with a country's population, the name is most common in the United States, Sweden, and Russia. Very seldom, Karlson is the forename as well as the last name.