In Croatia, Martelo families are Croats (from Daruvar area ). In the past century, relatively most of Croatian residents bearing this family name were born in Daruvar area.
Prevalence
About 10 people with faimily name Martelo live in Croatia today, in four households only. There were 20 of them in the middle of the past century, and their number halved. They are located in two Croatian counties, in one city and another small place , mostly in Djulovac in Daruvar area (<10) and Zagreb (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1924 in source Emigration Commission Zagreb.