In Croatia, Tudjan families are Croats (from Varazdin area ). In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin area and in Samobor.
Prevalence
About 20 people with faimily name Tudjan live in Croatia today, in 11 households. There were 30 of them in the middle of the past century, and their number decreased by 50 percent. They are located in four Croatian counties, threee cities and threee other places, mostly in Trnovec (<10) and Bartolovec (<10) in Varazdin area, Zagreb (<5), Varazdin (<5), and in Rakitje in Samobor area (<5).
Outside Croatia
At least two families with this surname emigrated from Croatia to the United States (1) and Uruguay (1). Family name Tudjan is present in 7 countries on four continents. The family name "Tudjan " 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 2007 in source Encyclopaedia of Croatian Surnames.