In Croatia, Rack families are Croats (from Djakovo ). In the past century, relatively most of Croatian residents bearing this family name were born in Djakovo.
Prevalence
Only a few people with faimily name Rack live in Croatia today, in two households only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in four Croatian cities only: in Osijek (<5), Djakovo (<5), Zagreb (<5), and in Kastav (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over forty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.