Šimun families are usually Croats and they are mostly from Osijek , rarely Hungarians. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Osijek. In Grabovnica in Cazma every fourtieth inhabitant had the family name Šimun.
Prevalence
About 80 people with faimily name Šimun live in Croatia today, in 30 households. There were 140 of them in the middle of the past century, and their number decreased by 40 percent. They are located in 10 Croatian counties, in 11 cities and 20 other places, mostly in Zagreb (20), Cepin in Osijek area (<10), Pregrada (<10), Valpovo (<10), and in Darda in Osijek area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.