From Proto-Germanic *awjō, originally a substantive adjective of *ahwō (“river”) ( > Old English ēa), from Proto-Indo-European *h₂ekʷeh₂. Cognate with Old High German ouwa (German Aue (“meadow”)), Middle Dutch ouwe, Old Norse ey (Swedish ö). More distantly related to Latin aqua (“water”), and its descendants: Italian acqua, Spanish agua and French eau.
- Middle English: ei, i, ie
- English: ey
- ⇒ Old English: īġoþ
- ⇒ Old English: īeġland, īġland