The Duke and Duchess of Cambridge have named their baby son Louis Arthur Charles.
In a statement, Kensington Palace said: “The Duke and Duchess of Cambridge are delighted to announce that they have named their son Louis Arthur Charles.
The prince is the duke and duchess’s third child, the younger brother of Prince George and Princess Charlotte, and the Queen and the Duke of Edinburgh’s sixth great-grandchild.
Lord Louis Mountbatten was Prince Charles’s beloved great-uncle who was assassinated by the IRA in 1979. Prince Louis of Battenberg was the Duke of Edinburgh’s grandfather.
Bookmakers had Arthur as the favourite for some time, then Alexander.
It has taken four days for the prince’s name to be released. He is fifth in line to the throne, and was born on Monday weighing 3.8kg (8lbs 7oz).
Both Prince George and Princess Charlotte’s names were revealed two days after their births. But Prince William’s name was not made public for seven days.
Historically, royal names are not usually announced for several days. Prince Harry was a recent exception. It was confirmed on the day he left hospital that he would be called Henry, though would be known as Harry. Prince Charles’s name was revealed one month after he was born, only being declared ahead of his christening in the Music Room at Buckingham Palace in December 1948.
The Queen is told, as a courtesy, before the name is announced.
Bookmakers celebrated the news. Alex Apati of Ladbrokes said Louis had been 10th in terms of bets placed, with odds as long as 20/1.
“Prince Louis has caught both bookies and punters by surprise. With it being one of Prince George’s middle names, fans didn’t see it as an obvious frontrunner for Kate and Wills’ second son,” he said.
The announcement is likely to prompt a revival in popularity of the name. While more common in the early 2000s, it had dropped to 71st place in the most popular name ranking in England and Wales, according to the latest Office for National Statistics figures.
Blackpool Zoo immediately announced a baby Louis of its own in celebration, bestowing the name upon a newborn double-humped Bactrian camel calf also born on Monday morning.