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Family name Harju (Harju , Харью) , in all the world, is quite a common surname. The cognomen Harju is characteristic of Northern Europe, particularly Finland, where it is a common surname, Latvia, where it is quite a rare surname, and Sweden. In absolute terms, this name is the most popular in Finland, the United States, and Sweden. Much less frequently, Harju is the forename as well as the last name.