Bilonić families are Croats and they are mostly from Sinj area. In the past century, relatively most of Croatian residents bearing this family name were born in Sinj area and in Sinj. In places Vrpolje and Čačvina in Sinj area every fourth inhabitant had the family name Bilonić.
Prevalence
About 340 people with faimily name Bilonić live in Croatia today, in 120 households. There were 20 of them in the middle of the past century, and their number multiplied. They are located in 9 Croatian counties, in 16 cities and 19 other places, mostly in Split (70), Zagreb (35), Trilj in Sinj area (35), Stobrec (30), and in Sinj (25).
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.