Košar families are Croats, mostly from Zagreb. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Koprivnica.
Prevalence
About 60 people with faimily name Košar live in Croatia today, in 30 households. There were 80 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 6 Croatian counties, in 11 cities and 5 other places, mostly in Zagreb (25), Zapresic (<10), Opatija (<10), Rijeka (<5), and in Sisak (<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.