In Croatia, Boštjančić families are generally Croats (from Delnice area ), very rarely Slovenes (from Rijeka ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and Zagreb.
Prevalence
About 20 people with faimily name Boštjančić live in Croatia today, in 12 households. There were 20 of them in the middle of the past century, and their number remains constant. They are only located in in 6 Croatian cities and four other places, mostly in Zagreb (<10), Ravna Gora in Delnice area (<10), Rijeka (<5), Matulji in Opatija area (<5), and in Bjelovar (<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.