In Croatia, Ruf families are generally Croats (from Hrvatska Kostajnica area ), very rarely Hungarians (from Osijek area ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Novska and Pakrac.
Prevalence
About 40 people with faimily name Ruf live in Croatia today, in 18 households. There were 50 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 9 Croatian counties, in 7 cities and 8 other places, mostly in Hrvatska Dubica (<10) and Slabinja (<10) in Hrvatska Kostajnica area, Vukovar (<5), Virovitica (<5), and in Kordusevci in Slavonski Brod area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.