In Croatia, Rull families are Croats (from Belisce ). In the past century, relatively most of Croatian residents bearing this family name were born in Belisce.
Prevalence
Only a few people with faimily name Rull live in Croatia today, in two households only. They are located in one Croatian city only, in Belisce (<5).
Outside Croatia
Family name Rull is present in 40 countries worldwide. "Ruell " is used by some 600 people in the United States , about 200 in Germany , and some 100 people in Belgium.