In Croatia, Lonza families are almost entirely Croats (from Dubrovnik ), barely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Dubrovnik.
Prevalence
About 50 people with faimily name Lonza live in Croatia today, in 30 households. There were 70 of them in the middle of the past century, and their number decreased by 30 percent. They are located in only five naselja i to in Dubrovnik (20), Zaton (15), in Soline (<10) and Cavtat (<5) in Dubrovnik area, and in Zagreb (<5).
Outside Croatia
At least three families with this surname emigrated from Croatia to: Chile (1), the United States (1), and to Germany (1). Family name Lonza is present in 20 countries worldwide.
In the sources analysed in the project Acta Croatica so far, the name is mentioned about one hundred times, the first time 1691 in source Catholic Church Parish Records.