I will chuck a wobbly if William and Catherine pick Diana for a girl, I will seriously be like this
That said, I don't think they are going to. I remember William saying "Noone is filling my Mother's shoes" and that gives me hope. It would be too much of a legacy to straddle the poor girl with. I love Mary and Victoria, but confusion is a potential snag with them given that Denmark already has a Mary, and Sweden already has a Victoria. I'm probably just being anal there. Charles
did want Victoria saved for a girl, and Crown Princess Victoria had already been born at that point. As for other girl names, they're long shots (respectable as they are) but I like Lucy, Evangeline, and Xanthe
Moving on to boy names, I like Aaron, Jack, and Xavier, but they're also long shots, albeit respectable ones. My guesses would be Arthur and/or George
On the issue of whether The Queen has to give her consent, I don't think she has any say in the matter, not when Princess Alexandra's Grandaughters could be called Zenouska and Flora