Gunnar

From the Old Norse name Gunnarr which was derived from the elements gunnr "war" and arr "warrior" (making it a cognate of GÜNTHER). In Norse legend Gunnar was the husband of Brynhildr. He had his brother-in-law Sigurd murdered based on his wife's false accusations that Sigurd had taken her virginity.

GüNTHER   male   German, Germanic Mythology
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.
EQUIVALENTS
ANCIENT GERMANIC: Gundahar
ANCIENT SCANDINAVIAN: Gunnarr
DANISH: Gunnar
GERMAN: Günter, Gunter, Günther, Gunther
GERMANIC MYTHOLOGY: Gundahar, Günther
NORSE MYTHOLOGY: Gunnar, Gunnarr
NORWEGIAN: Gunnar
SWEDISH: Gunnar