Family name Heiðrún (Heiðrún 
) , all over the world, is an extremely rare cognomen. Much more prevalently, Heiðrún is the forename as well as the last name.
Ósk, Kristinsdóttir, Sigurðardóttir, Þorgeirsdóttir, Unnsteinsdóttir, Júlíusdóttir, Guðmundsdóttir, Gunnarsdóttir, Þorsteinsdóttir, Þórðardóttir, Hákonardóttir, Heiðarsdóttir, Hauksdottir, Jóhannsdóttir, Jóhannesdóttir, Þórarinsdóttir, Lúðvíksdóttir, Hreiðarsdóttir, Höskuldsdóttir, Jónasdóttir, Bæringsdóttir, Sigfúsdóttir, Þrastardóttir, Finnsdóttir, Högnadóttir, Harðardóttir, Jónsdóttir, Pálsdóttir, Hlíðberg, Gréta, Björt, Ólafsdóttir, and Þorbjörnsdóttir