In Croatia, Janžeković families are Croats (from Zapresic area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Zapresic area.
Prevalence
About 10 people with faimily name Janžeković live in Croatia today, in 7 households. There were 30 of them in the middle of the past century, and their number decreased significantly. They are located in four Croatian cities only: in Zagreb (<10), Knin (<5), Luksici Ozaljski (<5), and in Slavonski Brod (<5).
Outside Croatia
Family name Janžeković is present in two countries.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.