Kosović families are predominantly Croats and they are mostly from Ploce area. According to some sources they are from River Cetina area and Zaostrog area, rarely Serbs from Zadar area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Dubrovnik. In Zaostrog in Ploce area every fifth inhabitant had the family name Kosović.
Prevalence
About 520 people with faimily name Kosović live in Croatia today, in 250 households. There were 650 of them in the middle of the past century, and their number decreased by 20 percent. They are located in the most of Croatian counties, in 32 cities and 42 other places, mostly in Zagreb (115), Zaostrog in Ploce area (45), Dubrovnik (40), Zadar (40), and in Split (30).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over twenty times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.