Where does “Assaí” come from?

Assaí (Portuguese) comes from Japanese 朝日, from Japanese 日, from Old Japanese 日, from Proto-Japonic *pi — day, sun.

Ancestry of “Assaí”, step by step

Step	Language	Word	Meaning
1	Japanese	朝日	Rising sun, morning sun
2	Japanese	日	Sunday
3	Old Japanese	日	the sun; sunlight, sunshine; daytime, daylight
4	Proto-Japonic	*pi	day, sun