From the Germanic name
Gundahar, derived from the elements
gund "war" and
hari "army, warrior". This was the name of a semi-legendary 5th-century Burgundian king. He appears in the Germanic saga the 'Nibelungenlied', which has him wooing the Icelandic queen
Brünhild. He wins her hand in marriage with the help of the hero
Siegfried. He ultimately betrays Siegfried, but Siegfried's widow
Kriemhild (Günther's sister) takes her revenge upon him.