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Last name Dahlin (达林 , Dahlin , ダーリン ) , in all the world, is quite a common family name. The surname Dahlin is habitual in Northern Europe, particularly Sweden, where it is quite a common surname, Denmark, where it is quite a rare surname, and Finland. In absolute terms, it is commonest in Sweden, the United States, and China. Also, Dahlin is the forename as well as the last name.