Tumbri families are Croats and they are mostly from Zagreb. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Bjelovar. In Kupinečki Kraljevec in Zagreb every sixth inhabitant had the family name Tumbri.
Prevalence
About 70 people with faimily name Tumbri live in Croatia today, in 30 households. There were 40 of them in the middle of the past century, and their number increased by 80 percent. They are located in four Croatian counties, threee cities and 14 other places, mostly in Zagreb (15), Brezovica (10), Gornji Stupnik in Samobor area (<10), Gudovac (<10), and in Desprim (<10).
Outside Croatia
Family name Tumbri is present in five countries on four continents. The family name "Tumbri " is used by small number of people in Australia and small number in the United States. "Tumbry " is used by some 80 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 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.