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Last name Янссон (Jansson , Янссон ) , in all the world, is a common family name. The cognomen Янссон is habitual in Sweden, where it is a common surname, Finland, where it is quite a common surname, and Eswatini (explore the name in all countries). In absolute terms, it is commonest in Sweden, Finland, and the United States. Very seldom, Янссон is the forename as well as the last name.