In Croatia, Derner families are generally Croats (from Orahovica area ), rarely Czechs (from Daruvar area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Nasice.
Prevalence
About 20 people with faimily name Derner live in Croatia today, in 11 households. There were 20 of them in the middle of the past century, and their number remains constant. They are located in 6 Croatian counties, threee cities and 5 other places, mostly in Fericanci in Orahovica area (<10), Varazdin (<10), Kaptol in Pozega area (<5), Golubinjak in Daruvar area (<5), and in Rovinj (<5).
Outside Croatia
Family name Derner is present in 24 countries worldwide. The family name "Derner " is used by some 600 people in the United States , about 300 in Brazil , and some 200 people in Germany.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1937 in source Emigration Commission Zagreb.