The official name of the Royal offspring, who was fifth in the queue to the throne, announced at Kensington Palace.
After four days of debating, the prince has been named Louis Arthur Charles Cambridge.
The happy couple - who just welcomed their third child, Louis Charles - were married on April 29, 2011 at Westminster Abbey in London, England, in front of 1,900 people in attendance, and millions more watching from around the world.
Kensington Palace announced via Twitter today (April 27) that the Duke and the Duchess of Cambridge have named their third child Louis Arthur Charles. Louis hails from across the Channel in France where it is a traditional royal name.
Following the little prince's birth, Prince William teased crowds by saying that the baby's name would be revealed "soon enough".
While the name Louis does not have especially strong ties to the British monarchy, it is believed the newborn may be named after Lord Louis Mountbatten, Prince Charles' great-uncle.
'Either they've gone completely off piste before with something like Zara (Princess Anne's daughter) or they've stuck to more traditional names.
Prince George was born in 2013 while Princess Charlotte took birth in 2015.
Bookmakers had been doing a brisk trade in bets on the new prince's name, but Louis wasn't among the favorites.
A zoo spokeswoman said the camel's name was simply Louis though some were already calling the camel "Prince Louis".
Author J.K. Rowling's digital publishing company Pottermore noted that the Weasley family in the Harry Potter books had members named Louis, Arthur and Charles.