In Croatia, Rein families are Croats (from Koprivnica ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Koprivnica.
Prevalence
About 10 people with faimily name Rein live in Croatia today, in 6 households. There were 10 of them in the middle of the past century, and their number remains constant. They are located in only four naselja i to in Zagreb (<10), Koprivnica (<5), Reka (<5), and in Donja Zelina (<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.