Ladbrokes, the online gaming company, said today that “82% of all wagers” are now predicting “a Princess is on the way.”
William, 32, and Kate, 33, are expecting their second child this month but have not released the baby’s gender.
The couple's first child, Prince George, will be 2 in July.
“Since the news was announced Prince George is to be joined by a sibling in 2015 the bookies have naturally kept the odds around a 50:50 chance, but punters continue to back the odds of a girl,” Ladbrokes said in a statement.
"A mystery gamble has developed on Alice in the last few days, and such is the support it's now the joint favorite with Elizabeth at 5/1," Ladbrokes spokeswoman Jessica Bridge told ABC News last week.
A second U.K.-based, online betting company, Betfair, has also reported the name Alice has overtaken the name Elizabeth as the most popular bet for William and Kate to name their next child.