Where does “nipponium” come from?

nipponium (English) comes from English Nippon, from Japanese 日本, from Japanese 日, from Old Japanese 日, from Proto-Japonic *pi — day, sun.

nipponium (English): A chemical element, supposed to be the...

Definitions

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