In Croatia, Marx families are Croats (from Krizevci ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb.
Prevalence
Only a few people with faimily name Marx live in Croatia today, in 6 households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in four Croatian cities only: in Zagreb (<5), Split (<5), Cubinec (<5), and in Konscica (<5).
Outside Croatia
Family name Marx is present in 118 countries worldwide. The family name "Marx " is used by some 30000 people in Germany , about 20000 in South Africa , and some 20000 people in the United States. "Marhx " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1927 in source Emigration Commission Zagreb.