Cognomen Kulja (Kulja 
, Куля 
) , around the world, is quite a rare last name. The cognomen Kulja is habitual in Ukraine, where it is quite a rare surname, Albania, and Serbia, where it is a rare surname. Measured by absolute frequency, it is commonest in Ukraine, Russia, and Turkey. Very seldom, Kulja is the forename as well as the last name.