In Croatia, Koczi families are Croats (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb.
Prevalence
Only a few people with faimily name Koczi live in Croatia today, in two households only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in one Croatian city only, in Zagreb (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1923 in source Emigration Commission Zagreb.