The official Wiki
I’m pretty sure that’s a fan site, nothing official about it…just like Derpibooru.
For some reason, on Derpibooru this pony has two completely different names.
Wiki names this pony “Love Melody”,
Also, to be honest, I’m not sure whichever name should be legitimately used or not, so I’m leaving this one for you to figure out
Well, the article you linked says:
…and the linked page explains “placeholder names” as:
They are not fanon, canon, or otherwise significant in any way except as placeholder names used for identification on the wiki.
…so i would not think that name carries any weight, unless Derpibooru wants to coordinate.
That said, given that
love melody is categorized as a character tag (and not linked with the other two names),
love melody (g1) is also a character-categorized tag (and, of course, is a different character altogether), and
love melody (g4) exists but isn’t categorized,
some kind of cleanup is needed, for sure.
