In Croatia, Košnjak families are Croats (from Koprivnica area ). In the past century, relatively most of Croatian residents bearing this family name were born in Split and Koprivnica.
Prevalence
About 20 people with faimily name Košnjak live in Croatia today, in 8 households. There were 20 of them in the middle of the past century, and their number remains constant. They are located in two Croatian counties, two cities and another small place , mostly in Legrad in Koprivnica area (10), Split (<10), and in Koprivnica (<10).
Outside Croatia
Family name Košnjak (including: Kosnjak , Koshnyak and Kosnyak ) is present in five countries.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.