In Croatia, Ćostović families are Bosniaks by relative majority (from Zupanja ), equally Croats (from Middle Bosnia ). In the past century, relatively most of Croatian residents bearing this family name were born in Middle Bosnia (Tesanj area).
Prevalence
Only a few people with faimily name Ćostović live in Croatia today, in two households only. They are located in 7 Croatian counties, in 6 cities and another small place , mostly in Koprivnica (<5), Zupanja (<5), Rijeka (<5), Osijek (<5), and in Zadar (<5).
Outside Croatia
Family name Ćostović (including: Costovic , Costovici ) is present in 6 countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1930 in source Emigration Commission Zagreb.