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Cognomen Urður (Urður ) , throughout the world, is an extremely rare surname. Much more prevalently, Urður is the forename as well as the last name.
Urdur, and Urthur
Snædal, Harðardóttir, Örlygsdóttir, Bergsdóttir, Björnsdóttir, and Eiríksdóttir