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.