Where does “良い” come from?

良い (Japanese) comes from Japanese よし, from Old Japanese よ, from Japanese 夜, from Old Japanese よる, from Proto-Japonic yoru, from Proto-Japonic yo — night.

良い (Japanese): good; easy; enough; not wanted any more

Definitions

  1. good; easy; enough; not wanted any more

Ancestry of “良い”, step by step

良い traces back through two separate lines of ancestry.

via Japanese よし

StepLanguageWordMeaning
1Japaneseよし縦し so-so; even if; 良し, 善し, 好し, 吉し, 佳し, 宜し all...
2Old Japanese
3Japanesenight, evening
4Old Japaneseよる
5Proto-Japonicyorunight
6Proto-Japonicyonight

via Classical Japanese 良し

StepLanguageWordMeaning
1Classical Japanese良し

Words derived from “良い

Every word from Proto-Japonic yoEvery word from Proto-Japonic yoruEvery word from Old Japanese よる
良い — Etymology, Origin & Word History | Etymology Explorer