[Z]

Personally I think they'll be trying to get the name Sugababes back in a bidding war, and if not then potentially something like MuSiKe (Mutya Siobhan Keisha) or 1.0 or "The Originals" or something like that. People are still going to refer to them as 'the original Sugababes' so I'd be surprised if the new name has nothing to do with the name Sugababes. Perhaps "One Touch" after their debut album, or "Overload" after their debut single.