Gustović families are Croats and they are mostly from Zabok area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Zabok area.
Prevalence
About 70 people with faimily name Gustović live in Croatia today, in 30 households. There were 130 of them in the middle of the past century, and their number halved. They are located in 7 Croatian counties and 7 other places, mostly in Zagreb (25), Bjelovar (15), Gornja Bistra in Oroslavje area (<10), Temovec in Zabok area (<10), and in Pula (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.