So they're all named after gems?
Aiogias - Iolite?
Rubifia - Ruby
Diagias - Diamond
Emergias - Emerald
Spinezia - Spinel
Topazia - Topaz
Jilbagias - Zircon(ium)?
Aiogias and Jilbagias are quite hard to figure out, these guesses are what comes up if you put the first part of their names (in katakana) on jisho and look for gemstones in the results, with the latter being Zircon because of the way katakana maps to romaji.
So maybe he should be Zirbagias instead? No opinions either way here, all the names are rather unusual to say the least.