Koloper families are Croats and they are mostly from Drnis. In the past century, relatively most of Croatian residents bearing this family name were born in Drnis and Sibenik.
Prevalence
About 90 people with faimily name Koloper live in Croatia today, in 30 households. They are located in threee Croatian counties, four cities and threee other places, mostly in Sibenik (55), Zagreb (10), Radonic (<10), Srima (<5), and in Grebastica (<5).
Outside Croatia
Family name Koloper is present in four countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.