In Croatia, Kockar families are almost entirely Croats (from Sisak ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Sisak and Osijek.
Prevalence
About 20 people with faimily name Kockar live in Croatia today, in 16 households. There were 70 of them in the middle of the past century, and their number decreased significantly. They are located in four Croatian counties and 5 other places, mostly in Osijek (10), Sisak (<10), Donje Komarevo (<5), Petrinja (<5), and in Tenja (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.