Antonac families are mainly Croats and they are mostly from Buzet area , but often Italians (from Buje area ). In the past century, relatively most of Croatian residents bearing this family name were born in Slovenia and in Buzet area. In Livade in Buzet area every fourth inhabitant had the family name Antonac.
Prevalence
About 80 people with faimily name Antonac live in Croatia today, in 30 households. There were 170 of them in the middle of the past century, and their number halved. They are located in four Croatian counties, in 6 cities and 9 other places, mostly in Antonci in Buje area (15), Umag (10), Livade in Buzet area (<10), Buzet (<10), and in Brtonigla in Buje area (<10).
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.