From a parallel thread in the "Star Wars" forum:
Relevant part of the article:
During a meeting with George Lucas, Lucas stated that he felt “Korriban” sounded too much like “Coruscant,” and wanted the name changed. This was discussed a bit in the Q&A, when Leland Chee suggested that often planets can have multiple names, and that may be a way to rectify this in the forthcoming canon. In general, it seemed to be a change that was completely out of the hands of Dave Filoni and was entirely a George Lucas decision.
....George freaking Lucas does it again.