Cognomen Kajiš (Каиш 
, Kajiš 
) , in the entire world, is a rare last name. The surname Kajiš is characteristic of Serbia, where it is a rare surname, Croatia, and Kazakhstan, where it is a very rare surname. In absolute terms, the name is most common in Serbia, Russia, and Kazakhstan. Very seldom, Kajiš is the forename as well as the last name.