Where does “nipón” come from?

nipón (Spanish) comes from Japanese 日本, from Japanese 日, from Old Japanese 日, from Proto-Japonic *pi — day, sun.

nipón (Spanish): Nipponese

Definitions

Step	Language	Word	Meaning
1	Japanese	日本	{{l\|en\|Japan}}; Japan
2	Japanese	日	Sunday
3	Old Japanese	日	the sun; sunlight, sunshine; daytime, daylight
4	Proto-Japonic	*pi	day, sun