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Cognomen Úlfhildur (Úlfhildur ) , in the world, is an extremely rare surname. Much more prevalently, Úlfhildur is the forename as well as the last name.
Ulfhild, Ulfhildur, Ulvhild, and Wulfhild
Indriðadóttir, Guðmundsdóttir, and Guðbjartsdóttir