Kaselj families are Croats and they are mostly from Vrlika. In the past century, relatively most of Croatian residents bearing this family name were born in Vrlika and Nasice.
Prevalence
About 240 people with faimily name Kaselj live in Croatia today, in 80 households. There were 80 of them in the middle of the past century, and their number tripled. They are located in the most of Croatian counties, in 15 cities and 22 other places, mostly in Jezevic (40), Zagreb (25), Nustar in Vinkovci area (20), Breznica Nasicka in Nasice area (20), and in Djakovo (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.