In Croatia, Diener families are Croats (from Mursko Sredisce ). In the past century, relatively most of Croatian residents bearing this family name were born in Vinkovci.
Prevalence
Only a few people with faimily name Diener live in Croatia today, in one household only. They are located in one Croatian city only, in Mursko Sredisce (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over twenty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.