We can all now refer to the royal baby as His Royal Highness Prince Louis Arthur Charles of Cambridge. Prince William's uncle Prince Edward also has Louis in his full name, Edward Antony Richard Louis.
Louis is now only the 71st most popular name for a baby boy in England and Wales. The name "Charles" is, of course, in honor of the baby's grandfather, Prince Charles.
As William also had a few royal events to attend last week - where he proved that life as a new dad is exhausting no matter who you are - it sounds like Kate and little Charlotte had Louis all to themselves.
Lord Mountbatten was assassinated at the age of 79 in an IRA bombing of his boat in August 1979.
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Louis's names are nothing new: Louis itself is one of Prince William's middle names and one of big brother Prince George's middle names.
"They won't want to appear old-fashioned or haughty, so choosing a name the public can embrace is equally important [to choosing a traditional one]", Turner previously told Hello magazine.
Leader of the Opposition Simon Bridges said it brought him "heartfelt joy" to congratulate Prince William and Catherine on the birth of their "beautiful bonny boy". Royal baby bookies had Arthur as the front-runner, with James and Philip in second and third.
Louis which is pronounced "LU-EE", means in French "renowned warrior".
The baby is Britain's first Prince Louis in more than a century.
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Also nominated are Harry Hadden-Paton of My Fair Lady , Joshua Henry of Carousel , and Tony Shalhoub of The Band's Visit . Anthony Boyle won a nomination for best featured actor for his work in " Harry Potter and the Cursed Child ".
Well some eagled-eyed royalists have gone back to Prince William and Kate Middleton's wedding day back in 2011 and pointed out how Kate pronounces her husband's middle name during their vows.
Footage of Kate Middleton has emerged which shows her revealing how we should really be pronouncing Prince Louis' name.
The first he heard of his noble namesake was when he arrived at work after the Duke and Duchess of Cambridge made the announcement.
A great-grandson of Queen Victoria and the son of a German prince, he was known as His Serene Highness Prince Louis of Battenberg.
The newborn is Queen Elizabeth's sixth great-grandchild.
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