Family name Dagný (Dagný 
, Дагни 
) , all around the world, is an extremely rare surname. The last name Dagný is habitual in Iceland, where it is quite a rare surname, and Ukraine, where it is an extremely rare surname. Much more frequently, Dagný is the forename as well as the last name.
Atla, Björnsdóttir, Bjarnadóttir, Reynisdóttir, Davíðsdóttir, Gísladóttir, Jakobsdóttir, Jóhannsdóttir, Einarsdóttir, Ingólfsdóttir, Ágústsdóttir, Þorsteinsdóttir, Stefánsdóttir, Baldvinsdóttir, Pétursdóttir, Ragnarsdóttir, Gunnarsdóttir, Guðmundsdóttir, Eiríksdóttir-Hansen, Haraldsdóttir, Ásgeirsdóttir, Sigurðardóttir, Sverrisdóttir, Sævarsdóttir, Ómarsdóttir, Ólafsdóttir, Rún, Ósk, Björk, Dimmblá, Gylfadóttir, Jónsdóttir, Egilsdóttir, Harðardóttir, Hauksdóttir, Hróbjartsdóttir, Björgvinsdóttir, Þrastardóttir, Sveinsdóttir, Arnarsdóttir, Reykjalín, Runólfsdóttir, Gunnarsd, Guðjónsdóttir, Gísladottir, Hreinsdóttir, Hjaltadóttir, Árnadóttir, Magnúsdóttir, and Kristjánsdóttir