They will probably go with a traditional name, but wouldn't it be nice if they chose one that it at risk of disappearing? Boys I went to school with were Kenneth, Keith, Nigel or even Gary. Kenneth was a 9 the century Scottish king who united the Scots and the Picts, it's historical.
I don’t think it will be Bertie too many memories for the Queen on Wallace and Bertie. Maybe another William? I like Alfred shortened to Alfie, although it doesn’t sound very Royal, now I think about it.