In Croatia, Rapp families are Croats (from Samobor area ). In the past century, relatively most of Croatian residents bearing this family name were born in Vukovar and Zagreb.
Prevalence
About 20 people with faimily name Rapp live in Croatia today, in five 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 Strmec in Samobor area (<10), Tovarnik in Ilok area (<5), Kutina (<5), Zagreb (<5), and in Dubrovnik (<5).
Outside Croatia
Family name Rapp is present in 70 countries worldwide. The family name "Rapp " is used by some 20000 people in the United States , about 10000 in Germany , and some 2000 people in France.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.