Fascinating Words
from Ken Grant

Berserk very likely comes from Old Norse 
Berr=bare       
erk=serc chain mail. 
For fighters who were so taken by the frenzy of battle that they would go off to fight without/bare of their chain mail/serc.
Wael actually the ae diphthong is Old English for those slain in battle/corpses.  Other compounds created from it are:
Wael-bed or bed of death
Wael-fah or slaughter stained
Wael-stow of battle field (Stow means field or place; hence, Bristow and other British sites ending in stow or stowe)
From these—Wael to Val and Valhalla or slaughter/corpse hall and Valkyrie or corpse-maidens.
I hine hraedlice      heardan clammum
On waelbedde         writhan thohte
                        Beowulf  lines 963-4
 
I him quickly     with a hard grasp
On the slaughter-bed thought to bind