Koški families are Croats and they are mostly from Valpovo area. In the past century, relatively most of Croatian residents bearing this family name were born in Osijek and in Valpovo area. In Satnica in Valpovo area every fourth inhabitant had the family name Koški.
Prevalence
About 220 people with faimily name Koški live in Croatia today, in 100 households. There were 320 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 10 Croatian counties, in 14 cities and 23 other places, mostly in Satnica (35) and Brodjanci (25) in Valpovo area, Osijek (25), Samatovci in Valpovo area (15), and in Ivanec (15).
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.