The story
- Proto-Germanic · inherited from*halbiją
- Old English · inherited fromhielfe
- Middle English · inherited fromhelfe
- English todayhelve
From Middle English helfe, helve; from Old English hielfe, from Proto-Germanic *halbiją. Probably cognate to English half, although Etymonline claims relation from halter and helm.
Etymology from Wiktionary, CC BY-SA 4.0.