Čustić families are mainly Croats and they are mostly from Zadar , often Bosniaks (from Bosnian Krajina ). In the past century, relatively most of Croatian residents bearing this family name were born in Zadar and Zagreb.
Prevalence
About 70 people with faimily name Čustić live in Croatia today, in 40 households. There were 30 of them in the middle of the past century, and their number more than doubled. They are located in 10 Croatian counties, in 14 cities and 9 other places, mostly in Zagreb (30), Zadar (10), Petrinja (<10), Brisevo in Zadar area (<10), and in Klobucak (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.