In Croatia, Greis families are predominantly Croats (from Valpovo ), rarely Germans (from Osijek ). In the past century, relatively most of Croatian residents bearing this family name were born in Ilok and Osijek.
Prevalence
Only a few people with faimily name Greis live in Croatia today, in two households only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in one Croatian city only, in Valpovo (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1929 in source Emigration Commission Zagreb.