But the wait was welcomed by U.K. bookmakers, who have taken in more than £1.6 million ($2.46 million) in baby-name bets as of Wednesday and reported a frenzy in demand since the birth.
Irish betting firm Paddy Power also said demand had shot up. "There’s been a lot of activity since it was announced that the baby was a boy," a representative told CNBC. "Up until then, the sex had been the betting focus."
Customers had placed around £500,000 in baby bets with the company, an amount that had even taken the company by surprise, he said.
Rival William Hill, which offered 50 name options including Thatcher at 250-1, said it had taken in over £400,000.