Zglavnik families are Croats and they are mostly from Djurdjevac. In the past century, relatively most of Croatian residents bearing this family name were born in Djurdjevac and Bjelovar.
Prevalence
About 70 people with faimily name Zglavnik live in Croatia today, in 40 households. There were 80 of them in the middle of the past century, and their number decreased by 10 percent. They are only located in in 7 Croatian cities and 8 other places, mostly in Bjelovar (15), Zagreb (15), Sirova Katalena (15), Djurdjevac (<10), and in Orovac in Bjelovar area (<10).
Outside Croatia
Family name Zglavnik is present in this form only in Croatia.
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.