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Last name Úlfur (Ulfur , Úlfur ) , around the globe, is an extremely rare cognomen. Much more frequently, Úlfur is the forename as well as the last name.
Ulf, Úlfr, Улф, Ульф, أولف, ウルフ, and 乌尔夫
Eldjárn, Árnason, Andrason, Reynisson, Úlfarsson, and Kristjánsson