Surname Магнус (Magnus 
, Magnús 
, Магнус 
) , in the world, is a common last name. The last name Магнус is characteristic of Norway, where it is quite a common surname, Fiji, and Iceland. Not in comparison with a country's population, it most frequently occurs in Nigeria, Brazil, and the United States. More frequently, Магнус is the forename as well as the last name.