The majority of the public think that Prince William and Kate Middleton's baby will be a brown-haired Princess called Alexandra.
An infographic by Coral also showed that people think the royal baby will be born in the morning and will weigh 7lb.
The current estimated amount that has been bet on the future King or Queen already stands at £1m.
A separate survey of 2000 adults revealed other popular names for the little one, who is due in the next few days.
Diana is still an overwhelming popular name with nearly 20% of people preferring to honour Diana, Princess of Wales with the new arrival's name.
The name George has been a favourite for many since Duchess Kate's pregnancy was announced and it continues to top the polls with nearly one fifth of people choosing the name in the survey.
As the world eagerly awaits the safe arrival of the Queen's third great-grandchild, one thing is certain. His or her official title will be His or Her Royal Prince or Princess of Cambridge.
Buckingham Palace made the announcement on Monday that the child will follow his or her parents who are known as the Duke and Duchess of Cambridge, respectively.
While the public are still undecided on what the baby's name might be, William and Kate also have yet to choose a name. They have reportedly drawn up a shortlist of names for their baby, but are waiting until he or she is born before making a final decision.
Even when the baby does arrive, it may be a while before the name is revealed to the public. Prince William's parents Prince Charles and Diana, Princess of Wales, waited a week before revealing the name of their first-born son.
Below are the results of the poll.
Gender of royal baby:
Top five most popular boys' names:
Top five most popular girls' names:
What colour eyes will the royal baby have?
What colour hair will the royal baby have?
Do you think the royals will have:
One baby 79.5%
It's a little princess!