In Croatia, Bolterštein families are Croats (from Pula ). In the past century, relatively most of Croatian residents bearing this family name were born in Buzet.
Prevalence
Only a few people with faimily name Bolterštein live in Croatia today, in one household only. They are located in two Croatian cities only, in Pula (<5) and Krusvari (<5).
Outside Croatia
Family name Bolterštein is present in five countries on three continents. The family name "Bolterstein " is used by some 60 people in the United States.