If I recall, there was a discussion about Shurikenger's real name in the Discord server, and that it was concluded after many rounds of digging, translating and comparing between various sources and sub releases that there was never an official mention of Shurikenger's real name at all, and that "Asuka Kagura" simply stemmed from translation errors as far back as many years ago during the early days of the modern fandom.
If that isn't enough, a little common sense would be wise; if "Asuka Kagura" was indeed his real name, then the Japanese fandom would've picked up on that as well a long time ago. However, running the name in Japanese via a web search yields zero Sentai-related results, which is strange still considering that even the rarest of tokusatsu tidbits and info would've been picked up by the most dedicated of Japanese tokusatsu fans who purchase the guidebooks related to the series.
Yes, we should strive to be factually correct and enforce that newly-suggested information should be cited with appropriate and trusted sources. However, this shouldn't imply an unspoken rule of "everything we say on our articles is right and you must prove us wrong". I feel the need to stress this especially in this particular situation, and rightfully so after analyzing the edits where the name was added:
None of these edits were cited with proper sources. I must especially highlight the edit made in 2007, as it was still the early days of the wiki's founding in its first few years, where it would be safe to assume that any policy on factually checking through edits and information wasn't enforced as strictly and stringently as it is now.
The point I am trying to drive here is, when it comes to information that is only available in supplementary material and not readily provided within the context of the series' broadcasted material, we must put such edits under more scrutiny, including reviewing any vague and obscure edits made many many years ago, because it is possible that people back then could've just thrown in whatever info they may have heard or seen without actually confirming if it was correct, and the rest of the fandom just went along with it as well.
I would strongly advise to give and take; it's become glaringly obvious that Shurikenger's real name is false.