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Surname Þórhildur (Þórhildur , Thorhildur ) , in all the world, is an extremely rare cognomen. Much more frequently, Þórhildur is the forename as well as the last name.
Lilja, Heimisdóttir, Hrafnsdóttir, Ásgrímsdóttir, Ólafsdóttir, Garðarsdóttir, Erlingsdóttir, Elínardóttir, Einarsdóttir, Stefánsdóttir, Svavarsdóttir, Gunnarsdóttir, Guðmundsdóttir, Þórhallsdóttir, Sigurðardóttir, Eiríksdóttir, Kristjánsdóttir, Elfarsdóttir, Guðjónsdóttir, Andrea, Daðadóttir, Lárusdóttir, Oddsdóttir, Pálsdóttir, Loftsdóttir, Jónasdóttir, Jónsdóttir, Magnúsdóttir, Sigþórsdóttir, Sæmundsdóttir, Sveinsdóttir, Karlsdóttir, Guðnadóttir, Torfadóttir, and Vilhjálmsdóttir