Jambrošić families are Croats and they are mostly from Mursko Sredisce area. In the past century, relatively most of Croatian residents bearing this family name were born in Cakovec and in Mursko Sredisce area. In Gornji Bukovac Žakanjski in Ozalj area every second inhabitant had the family name Jambrošić.
Prevalence
About 400 people with faimily name Jambrošić live in Croatia today, in 160 households. There were 470 of them in the middle of the past century, and their number decreased by 10 percent. They are located in the most of Croatian counties, in 20 cities and 42 other places, mostly in Zagreb (60), Cakovec (45), Podturen in Mursko Sredisce area (35), Varazdin (20), and in Mursko Sredisce (20).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 2007 in source Encyclopaedia of Croatian Surnames.