The middle name Charles is a tribute to the baby's grandfather.
So that's Louis, Arthur and Charles as first names. Mountbatten was killed by the Irish Republican Army, which detonated a bomb on his boat in 1979. "At the time I could not imagine how we would come to terms with the anguish of such a deep loss, since for me Lord Mountbatten represented the grandfather I never had".
"The average bet for the royal baby name has been about one pound".
"Arthur " stemming from Arthur Weasley who is, of course, the endearing patriarch of the family who's obsessed with everything from the Muggle world. He will also share the middle name of Arthur with his father.
He also took a break from caring for the prince to carry out royal duties on Wednesday when he joined Harry and Meghan Markle at an Anzac Day service in London.
Kate departed St. Mary's Hospital for Kensington Palace just hours after giving birth, posing upon her departure with William and their son.
Charlotte, who turns three next week, stole the show as she gave a cheeky wave to the crowd.
Both George and Charlotte attend local schools close to home - in stark contrast to William and Prince Harry's own experiences at boarding school outside of London - and the new prince is likely to follow suit.
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His regulation said that only the monarch, their children, their grandchildren and one other person could be called His or Her Royal Highness - this person being the Prince of Wales' first grandson.
It's thought by some that Charles and Camilla may be waiting to meet the new Prince with his mother, Queen Elizabeth II.
William and Kate finally announced the name of their son on Friday following his birth on Monday.
So it was unsurprising that conventional names were the favorites of the bookies before the latest announcement.
The two royal parents have returned to Kensington Palace with their newborn prince.
"Louis Mountbatten... was Prince Philip's uncle and pretty much his father", said Profe Kate Williams, royal history expert at the University of Reading. However, the name holds a strong personal connection.
On Thursday evening William suggested that the couple were still deciding on a name, telling reporters who asked about it: "I'm working on that". Prince Charles was a month old before his name was made public.
There have always been reports of tension between William, Catherine, Charles and the Middletons, over how often Prince Charles gets to see his grandchildren.