Kustić families are Croats and they are mostly from the Island of Pag. In the past century, relatively most of Croatian residents bearing this family name were born on the Island of Pag and in Rijeka.
Prevalence
About 340 people with faimily name Kustić live in Croatia today, in 150 households. There were 290 of them in the middle of the past century, and their number increased by 20 percent. They are located in the most of Croatian counties, in 19 cities and 18 other places, mostly in Kustici on the Island of Pag (90), Rijeka (75), Pag on the Island of Pag (50), Zagreb (30), and in Metajna on the Island of Pag (20).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over twenty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.