In Croatia, Schnell families are Croats (from Zagreb ).
Prevalence
About 10 people with faimily name Schnell live in Croatia today, in one household only. They are located in two Croatian cities only, in Zagreb (<5) and Miholjacki Porec (<5).
Outside Croatia
Family name Schnell is present in 56 countries worldwide. The family name "Schnell " is used by some 10000 people in Germany , about 8000 in the United States , and some 1000 people in France. "Schnöll " is used by some 500 people in Austria , about 300 in the United States , and small number of people in Canada , small number of people in Germany.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 2007 in source Encyclopaedia of Croatian Surnames.