In Croatia, Kocjan families are generally Croats (from Umag ), very rarely Slovenes (from Ivanic-Grad area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Cakovec area.
Prevalence
About 20 people with faimily name Kocjan live in Croatia today, in 9 households. There were 120 of them in the middle of the past century, and their number decreased significantly. They are located in 6 Croatian counties and two other places, mostly in Zagreb (<10), Umag (<5), Rijeka (<5), Pula (<5), and in Nedelisce in Cakovec area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.