Where does “Fuĵio” come from?

Fuĵio (Esperanto) comes from Japanese 富士, from Old Japanese 富士, from Ainu フヂ — fire.

Ancestry of “Fuĵio”, step by step

StepLanguageWordMeaning
1Japanese富士a hill resembling Mount Fuji
2Old Japanese富士—
3Ainuフヂfire
Every word from Ainu フヂ →Every word from Old Japanese 富士 →Every word from Japanese 富士 →
Fuĵio — Etymology, Origin & Word History | Etymology Explorer