Royal baby namings have not always been plain sailing.
According to British bookies, Albert and Arthur are tied as the most popular names, but James and Philip are also favorites.
The changes in the rules of succession make Princess Charlotte the first royal girl to welcome a baby brother and not lose her line in succession.
Princess Charlotte was christened Charlotte Elizabeth Diana - a nod to grandfather Prince Charles, the Queen, and late grandmother Diana.
Royal watchers were quick to point out the Prince George's middle name is Alexander, suggesting that it would be off-limits as it's already been used.
"On one hand there's a desire to inform the families before a public declaration is made and any new parent appreciates having a little private time to get to know their new addition before the onslaught of announcements", she said.