Cognomen Желько (Željko 
, Zeljko , Желько 
) , in the world, is quite a rare surname. The cognomen Желько is habitual in Southern Europe, particularly Bosnia and Herzegovina, where it is quite a common surname, Slovenia, and Serbia (explore the name in all countries). Not in comparison with a country's population, the name is most common in Southern Europe, particularly Bosnia and Herzegovina, Serbia, and Croatia. Much more frequently, Желько is the forename as well as the last name.