I think there will be some "family names" in there as well as Deville says a high chance of a fashionable upper class names which are often twists on old fashioned or classical names e.g Wilfred for Jack's nephew.
I don't necessarily think we're going to see Sarah Elizabeth Nicole or Phillip Andrew George, even though I'm sure one of those sorts of names will make it in at least. But even the Cambridges got a (tiny) bit more inventive than that, as did Eugenie's own names.
no probably for a girl it would be "fashionable name, Elizabeth Margaret" which is Sarah's second name...