Where does “eiȝti” come from?

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

Ancestry of “eiȝti”, step by step

StepLanguageWordMeaning
1Old Englishhundeahtatiġeighty
2Proto-Germanicahtōutēhundąeighty
Every word from Proto-Germanic ahtōutēhundą →Every word from Old English hundeahtatiġ →
eiȝti — Etymology, Origin & Word History | Etymology Explorer