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Last name Ottosson (Ottosson ) , globally, is quite a common cognomen. The last name Ottosson is habitual in Northern Europe, particularly Sweden, where it is quite a common surname, Iceland, and Norway, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Sweden, Norway, and Switzerland. Much less frequently, Ottosson is the forename as well as the last name.