As the world continues to await the birth of Kate Middleton and Prince William's royal baby, a new surge of bets indicate the couple may name their child Charlotte, if they have a girl.

"This gamble on Charlotte has taken us all by surprise," a spokesperson for London betting firm William Hall said in a statement to 'People.' "As in the last 24 hours, 90 percent of the wagers have been for Charlotte. Someone could easily have let something slip."

kate middleton and prince william

Kate, William and baby George in August 2013.

Earlier today, William's father, Prince Charles, 66, revealed he and the rest of the royal family are optimistic the Duke, 32, and Duchess of Cambridge, 33, will have a girl.

Related: Kate Middleton and Prince William Celebrate Fourth Wedding Anniversary Ahead of Royal Baby No. 2's Birth

"We're hoping for a granddaughter!" the future King of England exclaimed at an event at Windsor Castle on Thursday, April 30, according to 'People.'

prince charles and camilla

Charles and his wife, Camilla, Duchess of Cornwall, in June 2014.

Kate and William — who are already parents to 21-month-old Prince George — previously announced they were expecting their second child in September 2014. In the days leading up to the pregnant royal's April due date, fans of the couple began camping outside St. Mary's Hospital in hopes of catching a glimpse of the new baby.

In fact, one loyal supporter of the British monarchy rang in his 80th birthday outside the hospital's Lindo Wing this morning! "It would be a bonus for me if she had the baby today. I would feel closer to the family," Terry Hutt told 'People.'

terry hutt

Terry received a cake from the Kensington Palace staff for his 80th birthday.