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.
Revealing the baby prince's moniker after weeks of speculation, Kensington Palace confirmed: "The Duke and Duchess of Cambridge are delighted to announce that they have named their son Louis Arthur Charles".
Chief executive David Haigh told the BBC: "The birth of the new prince is a tremendous marketing opportunity for British producers and retailers of baby products who can reference the royal baby in their promotional campaigns".
Kensington Palace toasted the landmark date by tweeting a cute photograph of William and Kate together on their special day to it's 1.3million followers.
"The baby weighs 8lbs 7oz".
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Just wait for another announcement on the Taj Mahal as a decision is at an advanced stage, he said. They might put up signs outside to say that they have developed the amenities.
Bookmakers had been doing a brisk trade in bets on the new prince's name, but Louis wasn't among the favorites.
By the evening, the Duke and Duchess of Cambridge appeared on the steps of the Lindo Wing with their still unnamed son.
According to the same source, the little royals were so excited about their new family member that they would have likely skipped their usual bedtime and stayed up until their mum and dad returned home.
The Duchess of Cambridge knows how, though.
Big brother and sister Prince George and Princess Charlotte got to meet their little brother while he was still at hospital, in a display of cuteness that melted hearts all over the world.
Not only that, but if Charlotte had been born first, she still would've missed out on being a Princess.