In Croatia, Oppenheim families are Croats (from Opatija area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Sisak.
Prevalence
Only a few people with faimily name Oppenheim live in Croatia today, in five households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in two Croatian counties, in one city and another small place , mostly in Zagreb (<5) and Matulji in Opatija area (<5).
Outside Croatia
Family name Oppenheim is present in 35 countries worldwide. The family name "Oppenheim " is used by some 3000 people in the United States , about 500 in Germany , and some 400 people in France.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.