Ivanšić families are Croats and they are mostly from Zupanja area. In the past century, relatively most of Croatian residents bearing this family name were born in Zupanja area and in Zagreb. In Gradište in Zupanja area every fourtieth inhabitant had the family name Ivanšić.
Prevalence
About 90 people with faimily name Ivanšić live in Croatia today, in 30 households. There were 70 of them in the middle of the past century, and their number increased by 20 percent. They are located in 6 Croatian counties, in 8 cities and threee other places, mostly in Gradiste in Zupanja area (45), Zagreb (15), Slavonski Brod (<10), Cerna in Zupanja area (<10), and in Rijeka (<5).
Outside Croatia
Family name Ivanšić (including: Ivansic , Ivanshic ) is present in 6 countries on three continents.
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.