Their scripting language already has a name, Osiris
If they're going for god names, then this engine should clearly be called Ouroboros.
I'd argue Hephaestus (Hephaistos), Greek god of the forge. Don't you think?
Actually, while I think there are some creative names so far (like LarK & the Dragon Engine,) if for some reason we needed to keep brainstorming, I think "Forge" is a great place to start:
The Forge
Dragonforge
Larian Forge
But Hephaestus is a solid proper name, too.