By Nina Ruggiero
April 27, 2018
John Stillwell - PA Images/Getty Images

After months of speculation (and even betting), the third royal baby officially has a name.

Prince William and Kate Middleton named their newborn son — yes, in case you missed it, it's a boy — Louis Arthur Charles.

LittleLouis was born at 11:01 a.m. on Monday, April 23, at St. Mary's Hospital in London, Kensington Palace announced on Twitter. He weighed 8 lbs. and 7 oz.

Arthur, Albert, and James were bookies' top bets for boy names, although the odds were also set on the baby being a girl. The baby's full royal title is His Royal Highness PrinceLouisof the United Kingdom of Great Britain and Northern Ireland, royal historian Marlene Koenig told Town & Country, but Kensington Palace announced he'll go by His Royal Highness Prince Louisof Cambridge. You know, short and sweet.

John Stillwell - PA Images/Getty Images

Louis means “renowned warrior” in French, and People reported it is likely a way to honor Prince Philip, whose grandfather was Prince Louis Alexander of Battenberg. Prince William and Prince George both have Louis as part of their full names (William Arthur Philip Louis and George Alexander Louis), and the middle name Arthur is also a family tradition.

Karwai Tang/WireImage

Baby Louisjoins brother Prince George, 4, and sister Princess Charlotte, who will turn 3 on May 2. The baby boy's birth means Princess Charlotte just made history: Due to the Succession to the Crown Act, passed in 2013, she is the first female British royal to take precedence in line for the throne over her younger brother.

Gareth Cattermole/Gareth Cattermole/Getty Images

Of course, great-grandmother Queen Elizabeth II, grandfather Prince Charles and the rest of the family were "delighted" to hear the news.

Kate's sister, Pippa Middleton, is also reportedly expecting her first child with husband James Matthews. Reports say Pippa, 34, had her 12-week scan before revealing the news to family and friends, which would put her due date in October. That gives Louisabout five months to enjoy being the baby of the family. Live it up, little guy.