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Prince William, Duke of Cambridge, Kate Middleton, Catherine, Duchess of Cambridge

Chris Jackson/Getty Images

We know approximately when Kate Middleton is due to give birth (mid-to-end of April, in case your calendar is not yet properly marked), but there are still many unknowns about royal baby No. 2!

Will Prince George be getting a brother or a sister, and what will the little prince or princess' name be? No one knows, but plenty of people are placing bets now and hoping to cash in!

Many gamblers, it seems, are gunning for a girl. According to Ladbrokes' bookers, five times the amount of money has been wagered on a girl than a boy.  And what are the people pining for this potential princess to be called? "Elizabeth leads the way as the 5/1 favorite for the name of choice," Jessica Bridge of Ladbrokes tells HELLO!

This royal name is followed closely by Charlotte, Alexandra and James. "However, should Prince George be joined by a little brother next month, Albert has been a popular bet since we found out the couple was expecting back in October," says Bridge.

Metro U.K. combined Ladbrokes, Paddy Power and Coral's odds for their calculations, giving Elizabeth 7/2 odds, followed by James 8/1, Charlotte 9/2 and Victoria 10/1. Five names were tied with 12/1 odds: Philip, Alice, Mary, Arthur and Diana.

The site shared some unusual bets as well, like Tyrone (100/1), Macbeth (500/1), Ringo (5001/1) and Chardonnay (500/1).

Commoners are placing their bets on what color Duchess Kate will be wearing when she steps out with royal baby No. 2 for the first time— blue (3/1), pink (9/1) or possibly even orange (33/1) are all in the running.

Do you have any predictions of your own for Prince George's younger sibling? Sound off in the comments!

PHOTOS: Prince George's baby album!