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In all the world, Iðunn (Iðunn ) is a very rare feminine first name. The first name Iðunn is habitual in Northern Europe, particularly Iceland, where it is quite a rare feminine name.
Svansdóttir, Halldórsdóttir, Pétursdóttir, Ingólfsdóttir, Friðriksdóttir, Jóhannsdóttir, Grétarsdóttir, Ólafsdóttir, Geirsdóttir, Birgisdóttir, Bolladóttir, Arnarsdóttir, Sveinsdóttir, Magnúsdóttir, Hauksdóttir, Jónsdóttir, Hafsteinsdóttir, and Ásgeirsdóttir