Surname Halldóra (Halldóra 
) , in all the world, is an extremely rare family name. Much more frequently, Halldóra is the forename as well as the last name.
Aradóttir, Erlendsdóttir, Einarsdóttir, Eiríksdóttir, Hjartardóttir, Viðarsdóttir, Ingólfsdóttir, Þorvaldsdóttir, Sigtryggsdóttir, Baldursdóttir, Baldvinsdóttir, Gunnarsdóttir, Guðmundsdóttir, Halldórsdóttir, Ingimarsdóttir, Ásgeirsdóttir, Sigurðardóttir, Sigurgeirsdóttir, Steinarsdóttir, Kristinsdóttir, Kristjánsdóttir, Vilhjálmsdóttir, Traustadóttir, Jóhannsdóttir, Gísladóttir, Grétarsdóttir, Rafnsdóttir, Gestsdóttir, Jónsdóttir, Harðardóttir, Helgadóttir, Magnúsdóttir, Sveinsdóttir, Andrésdóttir, Birgisdóttir, Bjargardóttir, Þórarinsdóttir, Guðjónsdóttir, Tómasdóttir, Eyjólfsdóttir, Hannesdóttir, Hreinsdóttir, Árnadóttir, Ólafsdóttir, Sævarsdóttir, Björnsdóttir, Guðmarsdóttir, Guðlaugsdóttir, Geirharðsdóttir, and Valdimarsdóttir