In Croatia, Kociper families are almost entirely Croats (from Koprivnica area ), barely Slovenes (from Karlovac ). In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and Zagreb. In Donji Ramići in Cazins Region (Bosnia) every twentieth inhabitant had the family name Kociper.
Prevalence
About 50 people with faimily name Kociper live in Croatia today, in 30 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 four other places, mostly in Varazdin (25), Legrad in Koprivnica area (10), Zagreb (<10), Zadar (<5), and in Karlovac (<5).
Outside Croatia
Family name Kociper is present in 7 countries on three continents. The family name "Kociper " is used by small number of people in Canada , small number in the United States , and small number of people in Bulgaria.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1927 in source Emigration Commission Zagreb.