Janjiš families are Croats and they are mostly from Bosnian Posavina. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Derventa area) and in Imotsko.
Prevalence
About 140 people with faimily name Janjiš live in Croatia today, in 70 households. There were 50 of them in the middle of the past century, and their number tripled. They are located in 10 Croatian counties, in 14 cities and 13 other places, mostly in Zagreb (40), Postira on the Island of Brac (10), Imotski (10), Bukovlje in Slavonski Brod area (<10), and in Slavonski Brod (<10).
Outside Croatia
Family name Janjiš (including: Janjies , Janjis ) is present in two countries on two continents.
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.