Prefacing: we are a system of color
USING NAMES FROM CULTURES YOU AREN'T PART OF IS FINE!!! SO LONG AS: the culture is open, you do research on the culture's naming system, and do research on the specific name's meaning, origins, and cultural significance
If the name is very culturally significant and used for like... idk, random imaginary example: royalty only or something... DON'T USE IT. But otherwise— and so long as you're following the guidelines above— literally do WHATEVER YOU WANT. NO ONE CARES
I am BEGGING people to learn what cultural appropriation actually is. This is cultural APPRECIATION, not appropriation
ALSO. Because I see this in particular alot: JAPANESE IS NOT A CLOSED CULTURE (afaik). Maybe historically, but not anymore. But again, follow the guidelines above if you wanna use a Japanese name, just like you should with any name from any culture you aren't a part of
I know this is like an age old discussion in system spaces, but if I see one more minor in a syscord say "we have an introject from an anime and we don't want to 'appropriate' so they 'need' a new name" I might tweak out. Like it's fine if the introject genuinely just wants a new name but I promise they don't NEED one unless you've done no research into their original name at all