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Cognomen Wallin (沃林 , Wallin , ワリン) , all over the world, is a common surname. The last name Wallin is characteristic of Sweden, where it is a common surname, Finland, where it is quite a common surname, and Eswatini, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Sweden, the United States, and Finland. Much less frequently, Wallin is the forename as well as the last name.