In Croatia, Šidak families are mainly Croats (from Daruvar area ), equally Czechs (from Daruvar area ). In the past century, relatively most of Croatian residents bearing this family name were born in Daruvar and Zagreb.
Prevalence
About 10 people with faimily name Šidak live in Croatia today, in 6 households. There were 30 of them in the middle of the past century, and their number decreased significantly. They are located in threee Croatian counties, two cities and 5 other places, mostly in Sibovac (<5) and Suplja Lipa (<5) in Daruvar area, Marino Selo (<5), Dios in Daruvar area (<5), and in Daruvar (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1942 in source Phone Directory of the Independent State of Croatia 1942.