Well, there is a spoiler if your SMN is indeed still only 45 -the boss you have to fight during the level 50 SMN Job quest summons a palette-swap of Ifrit-Egi named Belias-Egi, so based on that we can assume it's likely SE have already reserved the Esper names from FFXII for use elsewhere as enemies the player has to fight for future SMN Job quests. Hence the Ascians bear the names of the Esper's 'light' opposites.