Where does “日進” come from?

日進 (Chinese) comes from Japanese 日進, from Japanese 日, from Old Japanese 日, from Proto-Japonic *pi — day, sun.

Ancestry of “日進”, step by step

StepLanguageWordMeaning
1Japanese日進daily progress
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 →