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Family name Fén (Фэн , Föhn , Fén) , in the world, is a rare cognomen. The cognomen Fén is characteristic of Switzerland, where it is a rare surname, Armenia, and Kyrgyzstan. Not in comparison with a country's population, this name is the most popular in Germany, Russia, and Switzerland. Much less frequently, Fén is the forename as well as the last name.