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Family name Dahlen (达伦 , Dahlen , Дален ) , around the world, is quite a common last name. The surname Dahlen is habitual in Northern Europe, particularly Norway, where it is quite a common surname, Sweden, where it is quite a rare surname, and Finland. In absolute terms, it is commonest in the United States, Norway, and Germany. Much less frequently, Dahlen is the forename as well as the last name.