In Croatia, Kosik families are Croats (from Vrbovec area ). In the past century, relatively most of Croatian residents bearing this family name were born in Vrbovec area and in Bjelovar.
Prevalence
Only a few people with faimily name Kosik live in Croatia today, in three households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in only four Croatian places: in Gradec (<5) and Gornji Marinkovac (<5) in Vrbovec area, Vrbovec (<5), and in Zetkan in Vrbovec area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over twenty times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.