Ištuk families are Croats and they are mostly from western Bosnia. According to some sources they are from Primorskoi Dolac area (Bakovici). In the past century, relatively most of Croatian residents bearing this family name were born in Western Bosnia (Livno area) and in Osijek. In places Žirović and Ljubunčić in Western Bosnia every seventh inhabitant had the family name Ištuk.
Prevalence
About 280 people with faimily name Ištuk live in Croatia today, in 100 households. There were 20 of them in the middle of the past century, and their number multiplied. They are located in 9 Croatian counties, in 17 cities and 20 other places, mostly in Zagreb (85), Vukovar (30), Split (30), Samobor (25), and in Kastel Gomilica (25).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 2007 in source Encyclopaedia of Croatian Surnames.