In Croatia, Mertz families are Croats (from Djakovo ). In the past century, relatively most of Croatian residents bearing this family name were born in Djakovo.
Prevalence
Only a few people with faimily name Mertz live in Croatia today, in three households only. They are located in two Croatian cities only, in Osijek (<5) and Djakovo (<5).
Outside Croatia
Family name Mertz is present in 46 countries worldwide. The family name "Mertz " is used by some 9000 people in the United States , about 2000 in France , and some 2000 people in Germany.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.