In Croatia, Boštjančič families are Croats (from Umag ).
Prevalence
About 10 people with faimily name Boštjančič live in Croatia today, in one household only. They are located in only two naselja i to in Crveni Vrh (<5) and Lisac in Opatija area (<5).
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.