In Croatia, Kladnjak families are Croats (from Orahovica area ). In the past century, relatively most of Croatian residents bearing this family name were born in Pozega and in Orahovica area.
Prevalence
About 10 people with faimily name Kladnjak live in Croatia today, in three households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in only two Croatian places: in Kutjevo in Orahovica area (20) and Golo Brdo in Pozega area (<5).
Outside Croatia
Family name Kladnjak is present in two countries on two continents. The family name "Kladnjak " is used by few people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1942 in source Phone Directory of the Independent State of Croatia 1942.