Well, if the name is already taken then I guess they have no choice in changing it.

" Riftrunner is Larian Studios� new role playing game set in the award-winning Divinity universe.
In Riftrunner, you become soul-forged with a Death Knight. Your fate is to spend the rest of eternity bonded to this creature of evil, unless you can undo this curse. You and your unlikely companion embark on a great adventure to unlock the secret of riftrunning... your only answer to this life of darkness!"

They could call the game "Divine Eternity" and I would guess that people would see the relation of the first game.

I understand it is a separate game that follows 20 years later, but it is in the same trend.