Cognomen Еркер (Jerker 
, Еркер 
) , throughout the world, is a very rare last name. The family name Еркер is habitual in Sweden, where it is a rare surname, Germany, where it is an extremely rare surname, and Ukraine. In absolute terms, this name is the most popular in Sweden, China, and Germany. Much more frequently, Еркер is the forename as well as the last name.