Where does “Nhật Bổn” come from?

Nhật Bổn (Vietnamese) comes from Japanese 日本, from Japanese 日, from Old Japanese 日, from Proto-Japonic *pi — day, sun.

Ancestry of “Nhật Bổn”, step by step

StepLanguageWordMeaning
1Japanese日本{{l|en|Japan}}; Japan
2Japanese日Sunday
3Old Japanese日the sun; sunlight, sunshine; daytime, daylight
4Proto-Japonic*piday, sun
Every word from Proto-Japonic *pi →Every word from Old Japanese 日 →Every word from Japanese 日 →