I think it's a lovely name. Anyone who's surprised that they picked something traditional hasn't been paying attention. One online article I read said that they might pick something out of the ordinary because some cousin of the prince had named his daughters Savannah and Isla (or something like that). Yes, that's fine for someone who's 25th in line for the throne, but not for the child that will, most likely, become king. While William and Catherine have been a bit non-traditional in some areas, I think in many others, they've shown a strong respect for tradition. Just like they were never going to name their daughter Diana, they were never going to name their son Dylan.
As for the PPD story, the baby was barely 24 hours old. How would the media know about that already? I call b.s. Plus, does PPD set in THAT fast? Like in a matter of hours?