Kuštreba families are Croats and they are mostly from Petrinja area. In the past century, relatively most of Croatian residents bearing this family name were born in Sisak and Kutina. In Žažina in Petrinja area every seventh inhabitant had the family name Kuštreba.
Prevalence
About 90 people with faimily name Kuštreba live in Croatia today, in 40 households. There were 180 of them in the middle of the past century, and their number halved. They are only located in in 7 Croatian cities and 14 other places, mostly in Zagreb (10), Petrinja (10), Stara Drencina (<10), Batina (<10), and in Novi Farkasic (<10).
Outside Croatia
Family name Kuštreba is present in four countries on three continents. The family name "Kustreba " is used by small number of people in the United States and small number in Australia.
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.