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Family name Долен (Dohlen , Долен ) , in the entire world, is a rare surname. The cognomen Долен is characteristic of Norway, where it is a rare surname, Germany, and Canada, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and Norway. Much less frequently, Долен is the forename as well as the last name.