Iduna

See the source for the meaning of the song name.

The song is part of the Hrafnagaldr Óðins.

In the youtube comments, you can find this translation :
Dwells in dales
the curious dís,
from Yggdrasill's
ash descended;
of elven kin,
Iðunn (Iduna) was her name,
youngest of Ívald's
elder children.