In Croatia, Bona families are Croats (from Dubrovnik ).
Prevalence
About 30 people with faimily name Bona live in Croatia today, in three households only. There were 20 of them in the middle of the past century, and their number increased by 60 percent. They are located in two Croatian cities only, in Zagreb (<5) and Dubrovnik (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1642 in source Catholic Church Parish Records.