After four days, Prince William and Kate Middleton has finally revealed the name they’ve chosen for their third royal baby boy.

“The Duke and Duchess of Cambridge are delighted to announce that they have named their son. Their royal baby name is Louis Arthur Charles,” Kensington Palace said in a statement Friday. “The baby will be known as His Royal Highness Prince Louis of Cambridge.”

The royal baby name does not have a strong British royal pedigree, being more commonly associated with kings of France. But there is a significant family connection – and one that is tinged with tragedy.

Louis (pronounced “LU-EE”) means “renowned warrior” in French, and is likely a tribute to Prince Philip, whose grandfather was Prince Louis Alexander of Battenberg. Louis is also part of Prince William’s full name of William Arthur Philip Louis and Prince George’s full name of George Alexander Louis. The name holds great meaning to William’s own father, Prince Charles, whose beloved great-uncle and mentor, Earl Louis Mountbatten, was assassinated by the IRA in 1979.

The name Arthur, which means “bear” in Celtic, is also rooted in mythology. King Arthur is a legendary figure who was head of the kingdom Camelot and the Knights of the Round Table in medieval times.

The newest arrival to the royal family was born on Monday at 11.01 am and weighed 8lbs, 7oz.

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