The name is believed to have little precedent within the modern British royal family.
The couple shared the news on Instagram, with an image of Queen Elizabeth and the Duke of Edinburgh meeting their newest great-grandchild.
The couple broke the news on their official Instagram account, along with an adorable black and white picture of the new family of three alongside the Queen, the Duke of Edinburgh and Meghan’s mother Doria Ragland.
The news read: “The Duke and Duchess of Sussex are pleased to announce they have named their first born child: Archie Harrison Mountbatten-Windsor.
“This afternoon Their Royal Highnesses introduced Her Majesty The Queen to her eighth great-grandchild at Windsor Castle. The Duke of Edinburgh and The Duchess’ mother were also present for this special occasion.”
An official announcement from the Palace reads: “The baby will be known as Archie Harrison Mountbatten-Windsor.” By deciding to call their son Archie Harrison Mountbatten-Windsor, Harry and Meghan have chosen not to use a title for their first born.
A source said: “They have chosen not to use a courtesy title.”
Photo credit: Chris Allerton ©️SussexRoyal