Šiško families are Croats and they are mostly from western Bosnia. In the past century, relatively most of Croatian residents bearing this family name were born in Western Bosnia (Tomislavgrad area) and in Western Bosnia (Livno area). In places Vinica and Zabrišće in Western Bosnia every ninth inhabitant had the family name Šiško.
Prevalence
About 340 people with faimily name Šiško live in Croatia today, in 120 households. There were 110 of them in the middle of the past century, and their number tripled. They are located in the most of Croatian counties, in 30 cities and 18 other places, mostly in Zagreb (65), Split (55), Podstrana in Solin area (30), Makarska (30), and in Stobrec (20).
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.