Of the Ifrit's three clues:
1: Universal Monsters, that's a gimme.
2: Seems to reference something underwater, potentially the same thing Legacy's "easy" Sealab clue is hinting at.
3: I don't think this is La Llorona, and no other IP really makes sense to me, so I think this is an original based around...some kind of "famous" woman in lore.
Add-On: Going back to Legacy's Sealab clue, with it not being Salt and being seen as "easy" by him, the codename I'm guessing is Pressure, the only remaining obvious underwater codename.