"They renamed it after [my emphasis] they drove all the Evocii off planet. The name means 'Glorious Jewel' in Huttese." Renamed it from Hutta to Nal Hutta, presumably (although that statement is not unequivocal).
The Evocii are still on Hutta in the game.
Might want to reread that first paragraph. They renamed it from Evocar to Nal Hutta. Hutta is simply a short form or nickname for Nal Hutta. My point was that it is the same planet.