Bonacin families are Croats and they are mostly from Split. According to some sources they are from Kastela. In the past century, relatively most of Croatian residents bearing this family name were born in Split and Zagreb.
Prevalence
About 80 people with faimily name Bonacin live in Croatia today, in 30 households. There were 40 of them in the middle of the past century, and their number doubled. They are located in threee Croatian counties, four cities and two other places, mostly in Kastel Sucurac (60), Zagreb (<10), Split (<10), Kastel Stari (<5), and in Kastel Kambelovac (<5).
Outside Croatia
Family name Bonacin is present in four countries on three continents.
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.