Žitnjak families are Croats and they are mostly from Zabok. In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and Zabok.
Prevalence
About 210 people with faimily name Žitnjak live in Croatia today, in 80 households. There were 160 of them in the middle of the past century, and their number increased by 30 percent. They are located in the most of Croatian counties, in 21 cities and 20 other places, mostly in Varazdin (35), Zagreb (20), Bjelovar (15), Spickovina (15), and in Novska (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.