In Croatia, Završnik families are Croats (from Buje ). In the past century, relatively most of Croatian residents bearing this family name were born in Virovitica.
Prevalence
About 10 people with faimily name Završnik live in Croatia today, in two households only. There were 20 of them in the middle of the past century, and their number halved. They are located in only two Croatian places: in Rezovac (<5) and Plovanija (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1926 in source Emigration Commission Zagreb.