Winxbloom, SE didn't start using the 'ra/ga/ja' suffix naming system for spells in the English language versions of the FF series until FFVIII, all FF English-language FF titles before then (FFI, IV 'easy type', VI and VII) used, surprise surprise, numeric titles. And before you pass judgement, FFXI actually used both, leading to ridiculously convoluted spell titles like Firaga IV.

As DefendPopPunk mentioned, Ferne explained SE's reasons for reverting to the original spell naming style for FFXIV back during ARR's Beta test, so it's pretty concrete then that SE has absolutely zero intention of changing the spell naming system to match recent FF titles.