In Croatia, Ruža families are Croats (from Varazdin ). In the past century, relatively most of Croatian residents bearing this family name were born in Middle Bosnia (Sarajevo area) and in Pozega.
Prevalence
About 20 people with faimily name Ruža live in Croatia today, in 11 households. There were 20 of them in the middle of the past century, and their number remains constant. They are located in 6 Croatian counties, in 6 cities and two other places, mostly in Varazdin (<10), Zagreb (<5), Pozega (<5), Velika Gorica (<5), and in Zapresic (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1937 in source Emigration Commission Zagreb.