In Croatia, Gustetić families are Croats (from Jastrebarsko ). In the past century, relatively most of Croatian residents bearing this family name were born in Jastrebarsko and Zagreb.
Prevalence
About 30 people with faimily name Gustetić live in Croatia today, in 12 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in only four naselja i to in Petrovina (15), Zagreb (10), Velika Gorica (<5), and in Jastrebarsko (<5).
Outside Croatia
At least two families with this surname emigrated from Croatia to the United States (1) and Germany (1). Family name Gustetić is present in two countries on two continents. The family name "Gustetic " is used by some 70 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 1942 in source Phone Directory of the Independent State of Croatia 1942.