Where does “朝飯” come from?

朝飯 (Japanese) comes from Japanese 朝, from Old Japanese 朝, from Proto-Japonic asa.

朝飯 (Japanese): Breakfast

Definitions

Step	Language	Word	Meaning
1	Japanese	朝	the morning; the morning, morn; the morrow, next...
2	Old Japanese	朝	the morning, morn; the morrow, next morning
3	Proto-Japonic	asa	—

朝飯 — Etymology, Origin & Word History | Etymology Explorer