In Croatia, Dervarić families are Croats (from Zagreb ).
Prevalence
About 10 people with faimily name Dervarić live in Croatia today, in one household only. 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 Dervarić is present in four countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1933 in source Emigration Commission Zagreb.