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Family name Guðbrandur (Guðbrandur ) , around the globe, is an extremely rare cognomen. Much more prevalently, Guðbrandur is the forename as well as the last name.
Arnarson, Jónsson, Guðbrandsson, Jóhannsson, Ingólfsson, Ólafsson, Thoroddsen, and Benediktsson