In Croatia, Trontl families are Croats (from Novi Marof area ). In the past century, relatively most of Croatian residents bearing this family name were born in Novi Marof area and in Karlovac.
Prevalence
About 10 people with faimily name Trontl live in Croatia today, in five households only. There were 30 of them in the middle of the past century, and their number decreased significantly. They are located in only two Croatian places: in Zagreb (<10) and Gornjaki in Novi Marof area (<5).
Outside Croatia
Family name Trontl is present in three countries on three continents. The family name "Trontl " 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 1902 in source Hartmann's General List of Apartments in Zagreb.