Refer to it as Chobby internally and on the forums, but call the application Zero-K as
GoogleFrog suggested.
Calling it anything similar to "Zero-K Lobby" is just going to bring confusion when people compare it with old Zero-K Lobby. Trust me, this confusion is guaranteed to happen as the lobby is probably one of the most important things that happened to ZK in the last year and one of the things that is the reason ZK is getting close to a Steam release.