Jermaniš families are Croats and they are mostly from Buzet. In the past century, relatively most of Croatian residents bearing this family name were born in Slovenia and in Buzet. In Selca in Buzet every third inhabitant had the family name Jermaniš.
Prevalence
About 80 people with faimily name Jermaniš live in Croatia today, in 30 households. There were 70 of them in the middle of the past century, and their number increased by 10 percent. They are located in threee Croatian counties, in 9 cities and 10 other places, mostly in Buzet (10), Rijeka (<10), Pula (<10), Selca (<10), and in Skuljari (<10).
Outside Croatia
Family name Jermaniš is present in four countries on three continents. The family name "Jermanis " is used by small number of 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.