When asked by a reporter what the baby's name is, Prince William replied: "I'm still working on that".
And now, after a number of high bets, Alexander is emerging as the leading name.
While this may not necessarily mean anything, it seems worth noting that this trick doesn't work for any of the other top predicted names for the new prince, like Arthur, James and Frederick.
It's expected once he has met his new grandson, the name will then be revealed.
Kate Middleton and Prince William didn't make us wait long from the announcement that Middleton was in labor with her third child to their standard post-birth photo op on the steps of the Lindo Wing.
After welcoming his third baby with wife Catherine on Monday, the Duke of Cambridge was back to his royal duties as he attended the Anzac Day Service of Commemoration and Thanksgiving at Westminster Abbey.
A page on the Royals' website reportedly listed the name on a thread that read "access denied".
But today at the central London sports centre he said that a name is still being decided upon.
However, for the first time, it looks like we have a very strong clue as to what they will pick.
And when another member of the crowd suggested the name Alexander, he joked: "Funny you should say that". "It's a good name".
At Queen Victoria's christening in 1819, there was a dispute over what she should be called.
"I think when we look at George and Charlotte's birth it's been a couple of days".