Only a few people with faimily name Riegler live in Croatia today, in households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in one Croatian city only, in Zagreb (<5).
Outside Croatia
Family name Riegler is present in 38 countries worldwide. The family name "Riegler " is used by some 3000 people in Austria , about 2000 in Germany , and some 2000 people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.