Family name Eynik (Ейник 
, Eynik 
) , across the world, is a very rare cognomen. The cognomen Eynik is characteristic of Kazakhstan, where it is a rare surname, Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname. In absolute terms, this name is the most popular in Kazakhstan, Russia, and the United States. Much less frequently, Eynik is the forename as well as the last name.