How The Royal Baby Got His Name
The Duke and Duchess of Cambridge have named their baby son Louis Arthur Charles.
The couple's third child, who was born in London on April 23 at 11.01am (local time), weighing 8lb 7oz (3.8 kilograms), will be known as Prince Louis, Kensington Palace announced on Friday after a four-day wait.
"The Duke and Duchess of Cambridge are delighted to announce that they have named their son Louis Arthur Charles," the Palace said in a short statement.
"The baby will be known as His Royal Highness Prince Louis of Cambridge."
The Duke and Duchess of Cambridge are delighted to announce that they have named their son Louis Arthur Charles.— Kensington Palace (@KensingtonRoyal) April 27, 2018
The baby will be known as His Royal Highness Prince Louis of Cambridge. pic.twitter.com/4DUwsLv5JQ
The baby is fifth in line to the throne and the Queen and the Duke of Edinburgh's sixth great-grandchild.
William and Kate's choice has come as a surprise as it is already one of Prince George's middle names. It also pays tribute to the Prince of Wales's great-uncle, Earl Mountbatten, who was murdered by the IRA.
Arthur had been a favourite with bookmakers for some time, with James and Philip also popular.
Alexander became a late front-runner after William remarked on the name at a Anzac Day service at London's Westminster Abbey while chatting with Australia's High Commissioner Alexander Downer, who asked William: "Have you thought of the name Alexander for him?"
"Well, it's funny you should say that. It's a good name," the duke replied.
Albert also entered the name race as the wait stretched on.
The middle name Charles is a tribute to the duke's father, the Prince of Wales.
Prince Louis joins four-year-old big brother George - christened George Alexander Louis in 2013 - and sister Charlotte Elizabeth Diana, who turns three next week. Their names were announced two days after their birth.