Keep the names, I say. Besides the parallels to RW naming conventions of discoveries, they are touchstones to the dawn, not just of the game, but of the hobby. Sure, they may be out of place in campaign settings that other than those of their origins, but D&D DOES allow for interplanar travel & multiple Prime Material planes...
If that still bugs you, realize that not every setting has an Ehlonna, Zagy, etc., and just change the names for your campaign.
FWIW, I sometimes do this myself. I was in a campaign in which there was a HR that allowed casters to learn Metamagically altered spells as distinct spells without having the feat. IOW, you could learn fireball as a 3rd level spell, as per normal. But you could learn Still Fireball as a distinct 4th level spell, one tht counted against your spells known.
My lightningphillic, armor wearing sorcerer PC learned ALL of his attack spells as either stilled or lightning (or both) versions, and plastered his name all over them.