In Croatia, Kopestenski families are Croats (from Djakovo area ).
Prevalence
Only a few people with faimily name Kopestenski live in Croatia today, in one household only. They are located in only one small Croatian place, in Donji Andrijevci in Djakovo area (<5).
Outside Croatia
Family name Kopestenski 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 1902 in source Hartmann's General List of Apartments in Zagreb.