Rupena families are Croats and they are mostly from Buzet area. In the past century, relatively most of Croatian residents bearing this family name were born in Buzet area and in Pula. In Vodice in Buzet area every fourth inhabitant had the family name Rupena.
Prevalence
About 60 people with faimily name Rupena live in Croatia today, in 40 households. There were 80 of them in the middle of the past century, and their number decreased by 20 percent. They are only located in in 9 Croatian cities and 8 other places, mostly in Umag (15), Pula (10), Buzet (<10), Sveti Martin (<10), and in Lanisce in Buzet area (<10).
Outside Croatia
At least five families with this surname emigrated from Croatia to the United States. Family name Rupena is present in 9 countries on four continents. The family name "Rupena " is used by some 70 people in the United States , small number in Italy , and small number of people in Australia. "Ruppena " is used by few 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 2007 in source Encyclopaedia of Croatian Surnames.