Prince Harry and Meghan Markle reveal Baby Sussex's name

Prince Harry and Meghan Markle revealed their royal baby's name on Wednesday.

Baby Sussex's name is Archie Harrison Mountbatten-Windsor.

"The Duke and Duchess of Sussex are pleased to announce they have named their first born child: Archie Harrison Mountbatten-Windsor," the new parents wrote on Instagram.

"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."

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Meghan Markle and Prince Harry debuted Baby Sussex, but didn't reveal the child's name until hours later. Archie Harrison was born on May 6.

Meghan Markle and Prince Harry debuted Baby Sussex, but didn't reveal the child's name until hours later. Archie Harrison was born on May 6. (Getty)

Mountbatten-Windsor is a surname used by some members of the royal family.

The couple did not choose an aristocratic title for the baby, who is not a prince but could have been given a title with "Lord" before his first name. The couple did not disclose why they had chosen the names — though the meaning of Harrison, "son of Harry," could be a clue.

After Archie Harrison was born on Monday morning, a beaming Prince Harry, 34, told reporters, "The baby is a little bit overdue so we've had a little bit of time to think about it. That's the next bit."

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Oddsmakers previously claimed that Alexander was the top choice, followed by Arthur — one of Prince Charles' middle names — for the first name of Prince Harry and Duchess Meghan's firstborn son.

Other runners up included Philip, after Prince Philip, Duke of Edinburgh — Queen Elizabeth II's husband.

Spencer was also speculated for a name as a tribute to Prince Harry's beloved late mother, Princess Diana.

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Meghan Markle and Prince Harry's son, Archie Harrison, made his debut on May 8. The child's name had yet to be revealed at the time.

Meghan Markle and Prince Harry's son, Archie Harrison, made his debut on May 8. The child's name had yet to be revealed at the time. (Getty)

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Duchess Meghan, 37, and Prince Harry, 34, first debuted their son Wednesday morning outside of their Windsor Castle home, but did not reveal his name at the time, keeping in line with their desire to protect their privacy during Meghan's pregnancy and the baby's delivery.

The Duke and Duchess of Sussex were elated at the birth of Archie Harrison.

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Meghan Markle and Prince Harry greet the press as they debut Baby Sussex. The couple met reporters at Windsor Castle, where they also met with Queen Elizabeth II and Prince Philip, Duke of Edinburgh.

Meghan Markle and Prince Harry greet the press as they debut Baby Sussex. The couple met reporters at Windsor Castle, where they also met with Queen Elizabeth II and Prince Philip, Duke of Edinburgh. (Getty)

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"It's magic! It's really amazing. I have the two best guys in the world, so I'm really happy," Duchess Meghan, clad in a white button-front double-breasted dress, said Wednesday morning.

"He's already got a bit of facial hair as well," Prince Harry, who held his son, joked to the press.

Duchess Meghan said that the baby boy has the "sweetest temperament," gushing, "He's really calm. It's just been a dream. It's been a special couple of days."

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Meghan Markle and Prince Harry proudly display their son, Archie Harrison. The royal baby was born May 6.

Meghan Markle and Prince Harry proudly display their son, Archie Harrison. The royal baby was born May 6. (Getty)

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"I wonder where he gets that from," Prince Harry remarked with a chuckle.

Prince Harry said that he and Meghan are not sure who Archie Harrison resembles most, noting that the royal baby's looks have been "changing every single day."

"Parenting is amazing. It's only been, what? Two and a half days, three days? But we're just so thrilled to have our own little bundle of joy. We're looking forward to spending precious times with him as he slowly, slowly starts to grow up," he said.

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Meghan Markle and Prince Harry coo over Archie Harrison. The royal baby is their firstborn son.

Meghan Markle and Prince Harry coo over Archie Harrison. The royal baby is their firstborn son. (Getty)

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Prince Harry couldn't hide his joy after the birth of the baby boy, telling press on Monday that he was "incredibly proud" of his wife of less than a year.

"Mother and baby are doing incredibly well," he said. "It's been the most amazing experience I could ever possibly imagine. How any woman does what they do is beyond comprehension but we're both absolutely thrilled and so grateful to all the lovely support."

The couple announced the birth of their son on their record-breaking @SussexRoyal Instagram account.

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The elusive Baby Sussex made his debut at Windsor Castle with parents Meghan Markle and Prince Harry. Duchess Meghan and the spare heir named their son Archie Harrison.

The elusive Baby Sussex made his debut at Windsor Castle with parents Meghan Markle and Prince Harry. Duchess Meghan and the spare heir named their son Archie Harrison. (Getty)

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The announcement read, "We are pleased to announce that Their Royal Highnesses The Duke and Duchess of Sussex welcomed their firstborn child in the early morning on May 6th, 2019. Their Royal Highnesses’ son weighs 7lbs. 3oz."

They also shared photos of Archie Harrison's debut on Instagram on Wednesday before revealing his name.

"Today The Duke and Duchess of Sussex are delighted to share their first public moment as a family," the couple captioned a series of photos from Windsor Castle.

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Their statement continued, "They are so incredibly grateful for the warm wishes and support they’ve received from everyone around the world since welcoming their son two days ago."

The Associated Press contributed to this report.