Huld
In Scandinavian mythology, Huld is only referenced by völva or seiðkona, that is a woman who practiced the seiðr. She is mentioned in the Ynglinga saga, Sturlunga saga and a late medieval Icelandic tale. In the latter source, she is Odin's mistress and the mother of the demi-goddesses Þorgerðr and Irpa. As her name suggests, Huld may be in origin the same being as the Huldra and the German Holda.
Read more about Huld.