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Family name Medlen (Medlen , Mesler , Medler ) , throughout the world, is quite a rare last name. The surname Medlen is characteristic of Slovakia, where it is quite a rare surname, the United States, where it is a rare surname, and Germany. Not in comparison with a country's population, this name is the most popular in the United States, Germany, and the United Kingdom. Much less frequently, Medlen is the forename as well as the last name.