As for Prince Louis’ middle names, Arthur was a middle name of Queen Elizabeth’s late father King George VI and is a middle name to both William and Prince Charles. Arthur of course also brings to mind King Arthur (though experts say there’s no evidence of any actual historical king behind the famous Arthurian legends).
Prince Louis shares his third name, Charles, with his grandfather, Prince Charles.
Louis Arthur Charles is the third child for the Duke and Duchess of Cambridge, who welcomed a son, Prince George, in 2013 and a daughter, Princess Charlotte, in 2015.
Ahead of Louis Arthur Charles’s birth, the couple announced via the official Kensington Palace Twitter account that Middleton was expecting in September 2017, but opted not to reveal the baby’s gender (something they had done with their previous two children) ahead of the birth.
The baby’s birth is just one of a series of exciting life events for the royal family this spring, as Prince Harry and Meghan Markle will be getting married next month on May 19th.