According to British bookies, Prince William and his wife Kate Middleton are likely to call their baby Frances or John.

Officials confirmed on Monday that Catherine, Duchess of Cambridge is pregnant with the couple's first child. She was hospitalized for a severe bout of morning sickness that requires supplementary hydration and nutrients.

Immediately royal watchers started speculating what the newest heir to the throne may be named.

According to bookmakers William Hill, Frances and John are the most likely names, with odds of 9/1, while Charles, Victoria and George are other favorites with 10/1 odds.

Many hope the baby will be named after Prince William's late mother, Diana, Princess of Wales. The odds of that are currently 12/1.