In Croatia, Fleis families are Croats (from Belisce ). In the past century, relatively most of Croatian residents bearing this family name were born in Belisce and Osijek.
Prevalence
Only a few people with faimily name Fleis live in Croatia today, in three households only. There were 10 of them in the middle of the past century, and their number remains constant. They are only located in in one Croatian city and another small place , mostly in Osijek (<5) and Bizovac in Valpovo area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1924 in source Emigration Commission Zagreb.