Sliško families are Croats and they are mostly from Bosnian Posavina. According to some sources they are from the Island of Brac. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Derventa area) and in Banja Luka Region, Bosnia (Laktasi area).
Prevalence
About 420 people with faimily name Sliško live in Croatia today, in 170 households. There were 10 of them in the middle of the past century, and their number multiplied. They are located in the most of Croatian counties, in 23 cities and 36 other places, mostly in Zagreb (125), Slavonski Brod (20), Pozega (15), Pula (15), and in Pleternica (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.