The story
- Old English · derived fromheonan forþ
- Middle English · inherited fromhennes forth
- English todayhenceforth
From Middle English hennes forth, hens-forþ, hennes-forþ, from modification of Old English heonan forþ with an adverbial genitive suffix. By surface analysis, hence (“from here”) + forth (“forward”).
Etymology from Wiktionary, CC BY-SA 4.0.