I think it might be 'e' for 'emacs' (there's precedent: eglot, eldoc, eshell, erc, emms) combined with 'ifrit', since "efrit" is a much less common spelling.

Yes, that's exactly why I chose it. It starts with an 'e' and it's not a super common spelling, so it wasn't taken.

Countries of origin kind of affect what's common. Where I'm from will write it efrit