In Croatia, Košč families are Croats (from Bjelovar ). In the past century, relatively most of Croatian residents bearing this family name were born in Bjelovar.
Prevalence
Only a few people with faimily name Košč live in Croatia today, in one household only. They are located in one Croatian city only, in Bjelovar (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over thirty times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.