Where does “eyȝty” come from?

eyȝty (Middle English) comes from Old English hundeahtatiġ, from Proto-Germanic ahtōutēhundą — eighty.

Ancestry of “eyȝty”, step by step

StepLanguageWordMeaning
1Old Englishhundeahtatiġeighty
2Proto-Germanicahtōutēhundąeighty
Every word from Proto-Germanic ahtōutēhundą →Every word from Old English hundeahtatiġ →