Thousands of punters are banking on the Duke and Duchess of Cambridge picking a traditional name for their newborn son.
George is the favourite at odds of 9/4, according to Sky Bet , with James also in the running at 11/4.
Alexander, Louis and Henry are also among the top choices for those placing bets at the bookmaker.
Punters willing to take a long shot can get odds of 66/1 on Daniel, or 50/1 for Andrew - after the baby's great uncle.
The Duke and Duchess of Cambridge are expected to follow tradition however, with most Royal infants having names that are passed down through the generations.
Charles Kidd, the editor of Debrett's Peerage & Baronetage, predicted that William and Kate would select a conventional first name for their son.
"I do think that Prince William is quite a traditionalist - that's my feeling," Mr Kidd said.
"The fact that he chose to use the Royal dukedom (of Cambridge) and has followed Royal precedent, I wouldn't be surprised if they use a name that is already familiar in the Royal Family - something that has Royal associations."
Midway through her pregnancy, Kate revealed she and William had a shortlist of names and that her friends were giving her ideas.
"We have a shortlist for both (boy and girl) but it's very difficult. My friends keep texting me names," she told a well-wisher.
David Beckham has also had his say, jokingly suggesting to Sky News recently that David would be a good choice.
The baby, who will eventually be king, will be styled HRH Prince (forename) of Cambridge, with - when a surname is needed - Mountbatten-Windsor as his family name.
Royal babies also usually have a number of middle names. The Prince of Wales has four names, as does William.
Charles, Philip and Michael are in the frame as possible middle names in honour of the Royal grandparent and great-grandparent and the baby's maternal grandfather.
Francis is another name considered to be a possible middle name because it has strong ties with the Duchess's family.
William's mother, Diana, Princess of Wales, was given the female version, Frances, as her middle name.
And then, of course, there is Henry - Prince Harry's real name.