In Croatia, Rutnik families are Croats (from Osijek ). In the past century, relatively most of Croatian residents bearing this family name were born in Osijek.
Prevalence
About 20 people with faimily name Rutnik live in Croatia today, in 8 households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in only four naselja i to in Osijek (15), Karlovac (<5), Tenja (<5), and in Zagreb (<5).
Outside Croatia
Family name Rutnik is present in 10 countries on four continents. The family name "Rutnik " is used by some 100 people in the United States and small number in Canada. "Ruthnick " is used by some 80 people in Peru and small number in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1938 in source Phone Book - Zagreb 1938.