In Croatia, Janz families are mainly Croats (from Osijek ), less frequently Germans (also from Osijek ). In the past century, relatively most of Croatian residents bearing this family name were born in Osijek.
Prevalence
Only a few people with faimily name Janz live in Croatia today, in three households only. They are located in two Croatian cities only, in Osijek (<10) and Zagreb (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1927 in source Emigration Commission Zagreb.