Kostić families are mainly Croats and they are mostly from north Herzegovina , also Serbs, very rarely Montenegrins. In the past century, relatively most of Croatian residents bearing this family name were born in North Herzegovina (Konjic area) and in Serbia. In places Orlište , Parsovići and Obrenovac in North Herzegovina every second inhabitant had the family name Kostić.
Prevalence
About 650 people with faimily name Kostić live in Croatia today, in 330 households. There were 330 of them in the middle of the past century, and their number doubled. They are located in almost all Croatian counties, in 54 cities and 67 other places, mostly in Zagreb (115), Rijeka (55), Pula (40), Markusica in Vinkovci area (30), and in Split (25).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over sixty times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.