In Croatia, Reder families are generally Croats (from Ilok area ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Garesnica.
Prevalence
About 20 people with faimily name Reder live in Croatia today, in 9 households. There were 70 of them in the middle of the past century, and their number decreased significantly. They are located in 6 Croatian counties, in 6 cities and two other places, mostly in Zagreb (<10), Osijek (<5), Samobor (<5), Suhopolje in Virovitica area (<5), and in Virovitica (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1935 in source Faculty of Humanities University of Zagreb Alumni.