Last name Þóra (Þóra 
) , globally, is a very rare cognomen. The surname Þóra is habitual in Northern Europe, particularly Iceland, where it is quite a rare surname. Much more frequently, Þóra is the forename as well as the last name.
Dal, Matthíasdóttir, Sævarsdóttir, Björnsdóttir, Bjarnadóttir, Einarsdóttir, Hjartardóttir, Þórðardóttir, Þorsteinsdóttir, Marteinsdóttir, Stefánsdóttir, Pétursdóttir, Ragnarsdóttir, Gunnarsdóttir, Guðmundsdóttir, Haraldsdóttir, Halldórsdóttir, Ásgeirsdóttir, Þorgeirsdóttir, Sigurðardóttir, Sigmundsdóttir, Kristinsdóttir, Þórsdóttir, Þórisdóttir, Ólafsdóttir, Óskarsdóttir, Briem, Styrktarfélag, Björg, Karítas, Flygenring, Úlfsdóttir, Pálsdóttir, Jónsdóttir, Njálsdóttir, Harðardóttir, Kristjánsdóttir, Helgadóttir, Samúelsdóttir, Sæmundsdóttir, Sveinsdóttir, Birgisdóttir, Guðjónsdóttir, Jónasdóttir, Elvarsdóttir, Hjaltadóttir, Víkingsdóttir, Árnadóttir, Magnúsdóttir, and Þórarinsdóttir