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Last name Jonassen (Jonassen , Витус , Йохансен ) , throughout the world, is quite a rare family name. The family name Jonassen is habitual in Northern Europe, particularly Norway, where it is quite a common surname, Denmark, and Sweden, where it is quite a rare surname. In absolute terms, this name is the most popular in Norway, Denmark, and the United States. Much less frequently, Jonassen is the forename as well as the last name.