There is only a handful of surnames from former Yugoslavia that can be declared to be exclusivelyfound among members of only one ethnic group( despite people posting false informationfor decades about surnames being *Serbian*, Croatian* etc...).
To establish the ethnicity of your ancestors you needto know their place of origin and to research and confirm their religious and ethnic affiliation in churchand other period records - for ethnic Serbs from Austria-Hungary:
Also what we use as there is no public census information is the information on the ethnicity of the victims of WWII in former Yugoslavia listed in the official Census of Victims of War 1941-1945, of people with the same surname from the same place of origin who were born before 1900. :
Of course before you can use any of these sources you need to confirm the original spelling of the surname before emigrating, and in their mother tongue and consider possible distorzion even before emigrating :
Start with Google -original accurate and confirmed surnames from around 1900. onward must show up if searched for in local languages - if you get no hits at allfor the spelling you have then the surname was/is spelled differently :
In available period records TERI? from Bosnia born in 1870s are ethnic Serbs, and TERI? from both Montenegro and Serbia born that same decade and later in XIX centuryare ethnic Montenegrin.The original surname TERI? has rare and small prevalence, which should make your research easier than the mostother ones "Rodoslovlje" assists with.