In Croatia, Grdan families are generally Croats (from Djurdjevac ), very rarely Bosniaks (from Bosnian Krajina ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Bjelovar.
Prevalence
About 50 people with faimily name Grdan live in Croatia today, in 20 households. There were 80 of them in the middle of the past century, and their number decreased by 40 percent. They are located in 7 Croatian counties, in 6 cities and 8 other places, mostly in Zagreb (<10), Cepelovac (<10), Djurdjevac (<10), Valbandon (<10), and in Berek in Cazma area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.