Nikolić families are frequently Croats and they are mostly from Imotski area. According to some sources they are from Bosnian Posavina , less frequently Serbs, and Roms (from Bosnian Krajina Region). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Bosanian Posavina (Brcko area). In places Borovica Gornja and Jelići in Middle Bosnia every second inhabitant had the family name Nikolić.
About 6000 people with faimily name Nikolić live in Croatia today, in 2600 households. There were 3200 of them in the middle of the past century, and their number increased by 90 percent. They are located in all Croatian counties, in 108 cities and 450 other places, mostly in Zagreb (975), Split (395), Sisak (375), Slavonski Brod (195), and in Pula (175).