In Croatia, Žero families are Croats (from Pula ). In the past century, relatively most of Croatian residents bearing this family name were born in Koprivnica.
Prevalence
Only a few people with faimily name Žero live in Croatia today, in one household only. They are located in one Croatian city only, in Pula (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1935 in source Emigration Commission Zagreb.