In Croatia, Rainer families are generally Croats (from Mursko Sredisce area ), very rarely Slovenes (also from Mursko Sredisce area ). In the past century, relatively most of Croatian residents bearing this family name were born in Cakovec.
Prevalence
About 10 people with faimily name Rainer live in Croatia today, in four households only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in only five naselja i to in Sveti Urban (<5) and Banfi (<5) in Mursko Sredisce area, Rijeka (<5), Umag (<5), and in Strigova in Mursko Sredisce area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.