Where does “日本井守” come from?

日本井守 (Japanese) comes from Japanese 井守, from Japanese 守り, from Japanese 守る, from Japanese 目, from Middle Chinese 目.

Ancestry of “日本井守”, step by step

日本井守 traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Japanese	井守	蠑螈 a salamandrid; Short for 赤腹井守; a job title in...
2	Japanese	守り	defense, protection
3	Japanese	守る	to stand watch over something, to be on the...
4	Japanese	目	an order in biology: smaller than a class, bigger...
5	Middle Chinese	目	—

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