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Last name Bohlen (波伦 , Bohlen , Болен ) , in the entire world, is quite a common surname. The last name Bohlen is characteristic of Switzerland, where it is quite a common surname, Germany, where it is quite a rare surname, and Liberia. Measured by absolute frequency, this name is the most popular in Germany, the United States, and Switzerland. Much less frequently, Bohlen is the forename as well as the last name.