Kasun families are Croats and they are mostly from Vrbovsko. In the past century, relatively most of Croatian residents bearing this family name were born in Vrbovsko and Sisak. In Veliki Jadrč in Vrbovsko every third inhabitant had the family name Kasun.
Prevalence
About 190 people with faimily name Kasun live in Croatia today, in 90 households. There were 240 of them in the middle of the past century, and their number decreased by 20 percent. They are located in the most of Croatian counties, in 18 cities and 29 other places, mostly in Zagreb (40), Veliki Jadrc (15), Osijek (10), Zadar (<10), and in Varazdin (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.