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Surname Smolen (Smolen , Смолень , Smoleń ) , around the world, is quite a common family name. The family name Smolen is habitual in Eastern Europe, particularly Poland, where it is quite a rare surname, Slovakia, and Czechia. Measured by absolute frequency, the name is most common in Poland, the United States, and Slovakia. Also, Smolen is the forename as well as the last name.