Šteko families are Croats and they are mostly from western Bosnia (Posusje, Tomislavgrad, Vinjani Gornji). In the past century, relatively most of Croatian residents bearing this family name were born in Western Bosnia (Tomislavgrad area) and in Imotsko.
Prevalence
About 190 people with faimily name Šteko live in Croatia today, in 80 households. There were 30 of them in the middle of the past century, and their number multiplied. They are located in the most of Croatian counties, in 19 cities and 14 other places, mostly in Zagreb (65), Makarska (10), Sesvete (10), Pula (10), and in Zadar (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.