After much speculation, Kensington Palace has announced the name of the Duke and Duchess of Cambridge's third child: His Royal Highness Prince Louis Arthur Charles of Cambridge.
Prince Louis was born at St Mary's Hospital, London on Monday 23 April weighing 8lbs 7oz. The couple introduced their baby boy to the world's media just a few hours after the Duchess had given birth and after Prince George and Charlotte had come to meet their new sibling.
The choice of name has come as a surprise to many as Arthur, Albert and Philip had all been touted as possible first name suggestions.
Harper's Bazaar spoke to Sarah-Jayne Ljungstrom, a baby name expert for Channel Mum and a YouTuber, about the origin, history and cultural associations of the name.
"Louis is a consistently popular name having wavered only 10 places from 61 to 71 in the name charts over the last decade. The name is French in origin and has a suitably strong meaning as ‘Famous in Battle’," she says.
Interestingly, Louis is also a meaningful choice for the royal family in four ways.
Not only is it one of Prince William's middle names, there was a Prince Louis of Battenberg who was William's great-great-grandfather, it was also the name of Lord Mountbatten, Prince Philip's beloved uncle who was killed by the IRA, plus it is one of Prince George's middle names which Ljungstrom says is a "lovely brotherly link".
As is often the case, the middle names are traditional and family-inspired.
According to Ljungstrom, Arthur was a "deeply unpopular" name ten years ago but has since rocketed more than 200 places in popularity, landing it at number 30 on the current baby name charts.
"It’s William’s middle name which is a thoughtful family link and the legendary King Arthur adds a special Royal pedigree," she says. "The name means ‘Bear’ - currently a popular baby name in its own right - and the ‘Art’ link suits this pair of History of Art graduates perfectly."
It's pretty clear to see where the inspiration for Charles comes from: The new baby's grandfather, of course, who will also be King one day. Ljungstrom says the name is "ever popular with the upper classes" and means 'man' or 'warrior'.
Overall, Ljungstrom's verdict is that the choice was "timeless and traditional" as expected while also perfectly complementing the Duke and Duchess' older children's names.
"The dutiful couple are mindful of their Royal responsibilities and have selected a name which works on three levels - as a suitably grand Royal name, on the international stage as the new Prince will be known across the globe, and also a moniker which is already popular in upper class playgrounds and matches their desire to give their children as ‘normal’ a childhood as possible," she says.