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Cognomen Ahlgren (Ahlgren , الغرين , Альгрен) , in the entire world, is quite a common last name. The last name Ahlgren is characteristic of Sweden, where it is quite a common surname, Malta, and Finland. In absolute terms, the name is most common in Sweden, the United States, and Finland. Very seldom, Ahlgren is the forename as well as the last name.