In Croatia, Resnik families are predominantly Croats (from Zagreb ), very rarely Slovenes (from Slovenia ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Varazdin.
Prevalence
About 30 people with faimily name Resnik live in Croatia today, in 14 households. There were 50 of them in the middle of the past century, and their number decreased by 50 percent. They are located in four Croatian cities only: in Zagreb (20), Varazdin (<5), Umag (<5), and in Samobor (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.