Surname Yerken (Еркен 
, Yerken 
) , throughout the world, is a very rare cognomen. The cognomen Yerken is habitual in Kazakhstan, where it is a rare surname, Kyrgyzstan, where it is a very rare surname, and Russia, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Kazakhstan, China, and Russia. Much more prevalently, Yerken is the forename as well as the last name.