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All over the world, Friðþjófur (Friðþjófur ) is an extremely rare masculine first name.
Fridjof, Fridtjof, Fridtjov, Frithiof, Frithjof, Frithjov, Fritiof, Fritjof, and Фритьоф
Másson, Eyjólfsson, Karlsson, and Stefánsson