Klašnja families can be both Serbs and Croats. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Otocac area. In Brezovac in Slunj area every second inhabitant had the family name Klašnja.
Prevalence
About 60 people with faimily name Klašnja live in Croatia today, in 40 households. There were 190 of them in the middle of the past century, and their number decreased significantly. They are located in the most of Croatian counties, in 12 cities and 11 other places, mostly in Zagreb (25), in Korenica (<10) and Seganovac (<10) in Otocac area, Osijek (<5), and in Rijeka (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1924 in source Emigration Commission Zagreb.