Koščica families are often Croats and they are mostly from Samobor , less frequently Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Samobor and Zagreb.
Prevalence
About 70 people with faimily name Koščica live in Croatia today, in 30 households. There were 190 of them in the middle of the past century, and their number decreased significantly. They are located in 10 Croatian counties, in 11 cities and 7 other places, mostly in Braslovje (25), Samobor (15), Rude (<10), Jastrebarsko (<10), and in Pula (<5).
Outside Croatia
Family name Koščica is present in 10 countries on four continents. The family name "Koscica " is used by some 200 people in the United States , small number in Russian Federation , and small number of people in Australia.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.