The story
- Proto-Germanic · inherited from*rīkijalīkô
- Proto-West Germanic · inherited from*rīkīlīkō
- Old English · inherited fromrīċlīċe
- Middle English · inherited fromrichely
- English todayrichly
Inherited from Middle English richely, from Old English rīċlīċe, from Proto-West Germanic *rīkīlīkō, from Proto-Germanic *rīkijalīkô; by surface analysis, rich + -ly (adverbial suffix).
Etymology from Wiktionary, CC BY-SA 4.0.