Bilavčić families are Croats and they are mostly from middle Bosnia. In the past century, relatively most of Croatian residents bearing this family name were born in Middle Bosnia (Travnik area) and in Glina.
Prevalence
About 90 people with faimily name Bilavčić live in Croatia today, in 30 households. They are located in the most of Croatian counties, in 13 cities and 10 other places, mostly in Karlovac (15), Petrinja (15), Bukovacki Antunovac in Slatina area (15), Vodice (<10), and in Grubisno Polje (<10).
Outside Croatia
Family name Bilavčić is present in two countries on two continents. The family name "Bilavcic " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.