Wikipedia
Hámundr
Hámundr is a minor character in Norse mythology.
Hámundr is known for two roles. Firstly, he was the son of Sigmund and the brother of Sigurd, Helgi Hundingsbane and Sinfjötli. Secondly, he was the father of Haki and Hagbard, two legendary sea-kings. His son Hagbard fell in love with Signy, a relative of Sigmund's enemy Siggeir (see Hagbard and Signy).