Šimag families are Croats and they are mostly from Zabok. In the past century, relatively most of Croatian residents bearing this family name were born in Zabok and Zagreb. In Tisanić Jarek in Zabok every sixth inhabitant had the family name Šimag.
Prevalence
About 130 people with faimily name Šimag live in Croatia today, in 50 households. There were 50 of them in the middle of the past century, and their number more than doubled. They are located in 8 Croatian counties, in 8 cities and 17 other places, mostly in Tisanic Jarek (50), Zagreb (35), Repovec (10), Lug Zabocki (<10), and in Mirkovec in Zabok area (<5).
Outside Croatia
Family name Šimag is present in three countries on three continents. The family name "Simag " is used by few people in the United States.
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.