Tudja families are Croats and they are mostly from Zabok. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Zabok.
Prevalence
About 70 people with faimily name Tudja live in Croatia today, in 50 households. There were 50 of them in the middle of the past century, and their number increased by 50 percent. They are located in 10 Croatian counties, in 11 cities and 10 other places, mostly in Zagreb (40), Oroslavje (<10), Split (<10), Pazin (<5), and in Grabrovec (<5).
Outside Croatia
Family name Tudja (including: Tudia , Thudia and Tudya ) is present in 8 countries on four continents.
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.