No Bloodstained name in Japanese?

Pretty sure it's just Bloodstained in all languages.

Yeah, I think that's kind of the implication. I guess I kind of knew that, but it's interesting to see it play out (and in comparing to MN9/Red Ash, who have Japanese translations of their updates, etc).

Stained glass is a western technique introduced in Japan, so, a Japanese Kanji word doesn't exist. Consequently, they try to write and speak it closer to English using KATAKANA, becoming ステンドグラス (SU.TEN.DO GU.RA.SU).

Indeed. Maybe the best thing to do is to translate the "Ritual of the Night", which can be "夜の儀式" (YO.RU NO GI.SHI.KI). To have an idea, it will be something like that:

I like the use of the sokuon in 'blood,' but I would use the elongated vowel in 'stained' instead: ブラッドステーンド

Minor different. Either way, what I have found interesting (and cool!) is that they are NOT doing that. It's Bloodstained.

Maybe they will incorporate it in the future, but so far they haven't bothered.... so I wonder if they will?

I didn't know that! Learning stuff everyday ⁄(⁄ ⁄•⁄ω⁄•⁄ ⁄)⁄

Yes.

Originally this song is only included in the SS version of SoTN. Remember in the PS version there's an empty room with only 1$ coin in it at the Catacomb? Well, in SS version, there's an exclusive item named "Lyrics Card". Obtain it, make half-fairy as your familiar then sit on a chair for a while, there's a chance you could hear the half-fairy sing this song.

Later, in the refined PS versions (Playstation the Best & PSone Books), they actually made this track into the game. Same condition, but they decided to left out the "Lyrics Card".

All above is based on Japanese version of SoTN, as for North American version, they never introduce half-fairy into the game until PSP version is out (her name is changed into simply "Fairy", as the counterpart of "Faerie"). So if you have PSP version, you could do the trick as above.
See more regional differences here: tcrf.net/Castlevania:_Symphony_of_the_Night_(PlayStation)#Regional_Differences
(This page also include some interesting things that underlie in the code of SoTN, something like debug area, test area, unused sprites and tiles, etc.)

I prefer to Japanese version of this song though, the lyrics is just beautiful and fits the atmosphere so well.

EDIT: Oh, if you're very addicted to those little facts in SoTN (like the peanuts), check this out: www.geocities.jp/clearfeathers/nocturne/others.html
But unfortunately it's in Japanese. I could do some translation if needed

I somehow remembered geocities' pages are actually not in Unicode. Try to set the codepage into Shift-JIS manually.

I was asking in Discord what the Japanese name and noone really said. So it's the same there then.