Ivšan families are Croats and they are mostly from Zagreb. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Osijek.
Prevalence
About 80 people with faimily name Ivšan live in Croatia today, in 40 households. There were 100 of them in the middle of the past century, and their number decreased by 20 percent. They are only located in four Croatian cities and 6 other places, mostly in Donji Dragonozec (25), Antunovac in Osijek area (20), Zagreb (15), Donji Trpuci (<10), and in Osijek (<10).
Outside Croatia
Family name Ivšan (including: Ivsan , Ivshan ) is present in 6 countries on four continents. The family name "Ivsan " is used by small number of people in the United States , small number in Germany , and small number of people in Australia.
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.