In Croatia, Tertan families are Croats by relative majority, equally Italians (from Rijeka ).
Prevalence
Only a few people with faimily name Tertan live in Croatia today, in two households only. They are located in one Croatian city only, in Rijeka (<5).
Outside Croatia
Family name Tertan is present in 6 countries on two continents. The family name "Tertan " is used by some 100 people in Romania , small number in the United States , and small number of people in Italy.