In Croatia, Bačkulić families are predominantly Croats (from Sibenik ), rarely Serbs.
Prevalence
Only a few people with faimily name Bačkulić live in Croatia today, in five households only. There were 20 of them in the middle of the past century, and their number halved. They are located in one Croatian city only, in Sibenik (<5).
Outside Croatia
Family name Bačkulić (including: Backulic , Backulich ) is present in four countries on two continents. "Backulich " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1928 in source Emigration Commission Zagreb.