In Croatia, Bastianić families are Italians (from Labin ).
Prevalence
Only a few people with faimily name Bastianić live in Croatia today, in four households only. There were 20 of them in the middle of the past century, and their number halved. They are located in two Croatian cities only, in Labin (<10) and Rijeka (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1692 in source Catholic Church Parish Records.