(In Old Norse sources the names are Gunnar, Brynhild, and Gudrún as normally rendered in English.) In fact, the Etzel of the Nibelungenlied is based on Attila the Hun.
The Völsungasaga (often referred to in English as the Volsunga Saga or Saga of the Völsungs) is a legendary saga, a late 13th century Icelandic prose rendition of the origin and decline of the Völsung clan (including the story of Sigurd and Brynhild and destruction of the Burgundians).