In Croatia, Šušnjak families are almost entirely Croats (from Sveti Ivan Zelina ), very rarely Ukrainians (from Vukovar ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Sveti Ivan Zelina.
Prevalence
About 30 people with faimily name Šušnjak live in Croatia today, in 14 households. There were 60 of them in the middle of the past century, and their number halved. They are located in four Croatian counties, four cities and 8 other places, mostly in Sesvete (<10), Zagreb (<5), Pretoki (<5), Vukovar (<5), and in Sveti Ivan Zelina (<5).
Outside Croatia
Family name Šušnjak (including: Susnjak , Shushnyak , Sushnyak and Susniak ) is present in 11 countries on three continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.