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Last name Jansson (Jansson , جانسون , ינסון ) , all around the world, is a common cognomen. The surname Jansson is characteristic of Sweden, where it is a common surname, Finland, where it is quite a common surname, and Eswatini (explore the name in all countries). Not in comparison with a country's population, the name is most common in Sweden, Finland, and the United States. Much less frequently, Jansson is the forename as well as the last name.