Family name Eyfer (Eyfer 
, Эйфер 
) , in all the world, is a very rare cognomen. The cognomen Eyfer is characteristic of Russia, where it is a very rare surname, Peru, where it is an extremely rare surname, and Venezuela. In absolute terms, it most frequently occurs in Russia, the United States, and Peru. Also, Eyfer is the forename as well as the last name.