In Croatia, Stupan families are predominantly Croats (from the Island of Krk ), rarely Montenegrins (from Vrbovec ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka.
Prevalence
Only a few people with faimily name Stupan live in Croatia today, in two households only. They are located in only two Croatian places: in Muraj on the Island of Krk (<5) and Lovrecka Velika (<5).
Outside Croatia
Family name Stupan (including: Stuppan , Stuphan ) is present in 13 countries on three continents. "Stuphan " is used by small number of people in the United States.