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Surname Jenssen (Jenssen , Єнссен , ינסן ) , all over the world, is quite a common family name. The cognomen Jenssen is habitual in Northern Europe, particularly Norway, where it is quite a common surname, Sweden, where it is quite a rare surname, and Estonia. In absolute terms, the name is most common in Norway, Germany, and the United States. Very seldom, Jenssen is the forename as well as the last name.