Final fanatics have put more effort into tracing her name's history than most royal families. There have been faces on currencies with less documentation. It's neatly summarized on the regular Wikipedia page:
Why this looks perfectly sane
Seems simple, right? Actual name, earlier version of the name, and not a single mention of tentacle porn. For most of you, the difference between "Aeris" and "Aerith" is so tiny that you're sort of upset I even mentioned it. But that line is the tip of 18,000 words of vicious online bullshit. Not debate, not discussion -- just a flaming screaming match with people posting entire new subsections just to call everyone else involved an idiot.
Someone here has definitely lost their mind, yes.
These chucklefucks got more upset than a Klingon with a lisp trying to voice-deactivate a ship's self-destruct. They argued for longer than most players even remembered playing the game. They argued the validity of Japanese translations with all the linguistic skill and respect of sex tourists.
Yes, that last one DID redefine the Hebrew until it ended in "s" instead of "th."