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Family name Friðþjófur (Friðþjófur ) , all over the world, is an extremely rare last name. Much more frequently, Friðþjófur is the forename as well as the last name.
Fridjof, Fridtjof, Fridtjov, Frithiof, Frithjof, Frithjov, Fritiof, Fritjof, and Фритьоф
Másson, Eyjólfsson, Karlsson, and Stefánsson