Fire I, Fire II, Fire III

[Texa]

-Ra means “second” and -ga means “third” in Japanese. To translate ファイラ into Fire II would be just as correct as the "Romanized" Fira. So it comes down to which you prefer.

It's really no different than translating しらゆきひめ to Shirahuki Hime, Snow-white Princess, or as we know it, Snow White (fairy tale).

Where are you getting that from? I know counting objects in Japanese is kind of weird, but I ran what you said by a friend who has a master's degree in Japanese and she says "First time i hear "ra" means 2nd and "ga" 3rd lol". BUT REPEATING THIS, I know counting in Japanese can be kind of weird especially when it comes to foreign words.

Also for reference I've dug up a Japanese fandom guide to black magic throughout the entire series if you ever want to skim for what spells are called in Japanese for your own reference.