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Queen Elizabeth II’s full name is Elizabeth Alexandra Mary; Prince William’s William Arthur Philip Louis Windsor.

The name raises speculation that if he were to become king the new prince would choose the title George VII, but there is no guarantee that as monarch he would use his first name.

His great-great-grandfather, George VI, the Queen’s father, was christened Albert Frederick Arthur George and used his fourth name when he came to the throne, although he was known by his family as Bertie (George VI is also the monarch portrayed by Colin Firth in the film The King’s Speech.)

The name Louis could be a tribute to Lord Louis Mountbatten, the Duke of Edinburgh’s uncle and the last British Viceroy of India before independence in 1947. William’s father, Prince Charles, was close with Mountbatten, who was assassinated by the Irish Republican Army in 1979.

The name Louis has also left broadcasters asking Kensington Palace “is it ‘Lou-ee’ or ‘Lou-iss?'” (For the record, it’s Lou-ee, in the French style.)

Alexander was said to be a favourite of Kate’s, according to the BBC, which also reported the Duchess had told someone they had a shortlist of names during the pregnancy, but friends also texted the couple with their own suggestions.

The announcement from Prince William and Kate — just two days after the baby’s birth — was quick, by royal standards.

The Queen and the Duke of Edinburgh took a month before settling on the name Charles for the Prince of Wales. Diana, Princess of Wales, and Prince Charles took a week before settling on William’s four names.