In Croatia, Kladarin families are mainly Serbs, equally Croats (from Sisak ). In the past century, relatively most of Croatian residents bearing this family name were born in Hrvatska Kostajnica area and in Sisak.
Prevalence
About 20 people with faimily name Kladarin live in Croatia today, in 14 households. There were 40 of them in the middle of the past century, and their number halved. They are located in four Croatian counties, in 6 cities and 5 other places, mostly in Zagreb (<10), Osijek (<5), Greda (<5), and in Drljaca (<5) and Borojevici (<5) in Hrvatska Kostajnica area.
Outside Croatia
Family name Kladarin is present in three countries.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1933 in source Emigration Commission Zagreb.