In Croatia, Bolterstein families are almost entirely Croats (from Buzet ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Buzet and Rijeka. In Krušvari in Buzet every third inhabitant had the family name Bolterstein.
Prevalence
About 30 people with faimily name Bolterstein live in Croatia today, in 14 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in two Croatian counties, four cities and 5 other places, mostly in Matulji in Opatija area (<10), Krusvari (<10), Rijeka (<5), Buzet (<5), and in Opatija (<5).
Outside Croatia
Family name Bolterstein is present in five countries on three continents. The family name "Bolterstein " is used by some 60 people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.