In Croatia, Magnus families are Croats (from Trogir area ).
Prevalence
Only a few people with faimily name Magnus live in Croatia today, in one household only. They are located in only two Croatian places: in Zagreb (<5) and Seget Vranjica in Trogir area (<5).
Outside Croatia
Family name Magnus is present in 86 countries worldwide. The family name "Magnus " is used by some 7000 people in Brazil , about 5000 in the United States , and some 3000 people in Germany.