In Croatia, Kosar families are almost entirely Croats (from Garesnica area ), barely Hungarians (from Garesnica area ). In the past century, relatively most of Croatian residents bearing this family name were born in Garesnica area and in Garesnica.
Prevalence
About 50 people with faimily name Kosar live in Croatia today, in 20 households. There were 70 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 8 Croatian counties, in 8 cities and 6 other places, mostly in Bjelovar (10), Zagreb (10), in Velika Trnovitica (<10) and Nova Ploscica (<5) in Garesnica area, and in Vukovar (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.