The most annoying thing about many of these entries is that in a misguided attempt to be objective they present things as "up for debate" that aren't legitimately up for debate. "Arilou La'Leelay" is explicitly stated in the game to be a Celtic name, given to the Arilou by the "children of the Celts".
Go ahead and make any changes you feel are appropriate. I haven't played through the game since over seven years ago; sometimes I can't remember what was stated as fact and what was conjecture.
I probably will soon enough when I've got time, but I want to note that this article needs a full rewrite; numerous things about it are factually wrong. The Arilou do *not* militarily defend the area around the natural QS portal; they act utterly pacifistic and refuse to engage you in combat even if you goad them repeatedly. They also don't seem to "jealously guard" this secret, since the Spathi, Melnorme et al. discover it without trouble -- just none of them have the guts to enter the Portal.
No evidence that the Arilou care at all about the Androsynth or the Syreen. The Arilou actually directly *abandon* the Syreen to be defeated after the slave-shielding of Earth -- they don't stick around at all to see what happens to the Syreen. And though they're fully aware of what happened to the Androsynth there's no evidence they intervened to help them, nor do they ever claim that they did so; they just use that as a reason to warn *you* not to mess with DF. They come off as incredibly Human-centric. (On the other hand, the game *does* mention that they tampered with the development of the Thraddash, although purely for fun.)
Leaving aside magic sci-fi technology, "crossbreeding the two species" would not guarantee that they would remain that genetically similar over time; parapatric speciation does occur and, in fact, is inevitable when you have a strong bottleneck like that between two separated groups of a main species. The only plausible non-magic explanation is that the two subspecies were separated in very recent evolutionary time (which makes sense, since the story only really needs to start with the dawn of Human history, about 10,000 years ago).
Finally, I think I'm cutting out this stuff about Falayaliralfali looking like Earth, since in this screenshot:
the resemblance is very superficial. For one thing, Falayaliralfali's continents don't match Earth's continents' shape. For another, the continents are purple.