In Croatia, Buinac families are Croats by relative majority (from Hrvatska Kostajnica area ), equally Serbs, and barely Slovaks (from Sisak ). In the past century, relatively most of Croatian residents bearing this family name were born in Sisak and Zagreb. In Buinja in Hrvatska Kostajnica area every fourth inhabitant had the family name Buinac.
Prevalence
About 50 people with faimily name Buinac live in Croatia today, in 20 households. There were 60 of them in the middle of the past century, and their number decreased by 10 percent. They are located in 7 Croatian counties, in 10 cities and 7 other places, mostly in Sisak (20), Zagreb (15), Vinkovci (<10), Vukovar (<5), and in Zapresic (<5).
Outside Croatia
Family name Buinac is present in four countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1930 in source Emigration Commission Zagreb.