Šiškić families are Croats and they are mostly from Bosnian Posavina. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Modrica area) and in Slavonski Brod.
Prevalence
About 90 people with faimily name Šiškić live in Croatia today, in 30 households. They are located in 8 Croatian counties, in 7 cities and 11 other places, mostly in Gundinci in Djakovo area (40), Zagreb (20), Velika Gorica (<10), Garcin in Slavonski Brod area (<10), and in Slavonski Brod (<5).
Outside Croatia
Family name Šiškić (including: Siskic , Shishkich ) is present in four countries.
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.