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Last name Iðunn (Iðunn ) , in all the world, is an extremely rare cognomen. Predominantly, Iðunn is the forename as well as the last name.
Svansdóttir, Halldórsdóttir, Pétursdóttir, Ingólfsdóttir, Friðriksdóttir, Jóhannsdóttir, Grétarsdóttir, Ólafsdóttir, Geirsdóttir, Birgisdóttir, Bolladóttir, Arnarsdóttir, Sveinsdóttir, Magnúsdóttir, Hauksdóttir, Jónsdóttir, Hafsteinsdóttir, and Ásgeirsdóttir