Prince Harry and Meghan Markle named their daughter in a touching tribute to Queen Elizabeth and Princess Diana

• The Duke and Duchess of Sussex welcomed a baby girl on June 4 in Santa Barbara, California.
• The couple named their second child Lilibet Diana Mountbatten-Windsor.
• Lilibet is a reference to Queen Elizabeth, while the late Princess Diana the middle name.
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The Duke and Duchess of Sussex have welcomed their second child, a baby girl named Lilibet.

The royal couple announced that their daughter arrived on June 4 at 11:40 a.m. at Santa Barbara Cottage Hospital in California, an official statement said. The child, who weighed 7 lbs and 11 oz, was named Lilibet Diana Mountbatten-Windsor.

"Lili is named after her great-grandmother, Her Majesty The Queen, whose family nickname is Lilibet," the statement said. "Her middle name, Diana, was chosen to honor her beloved late grandmother, The Princess of Wales."

Queen Elizabeth was nicknamed Lilibet by her grandfather, King George V

In "The Queen and Country: The Fifty-year Reign of Elizabeth II," biographer William Shawcross explained that "Lilibet" was a childhood nickname for Queen Elizabeth and was coined by her grandfather, King George V.

Shawcross wrote that the nickname might have originated from how the Queen pronounced her own name as a young child.

The nickname was also used by the Queen's father, King George VI, who once said of his two daughters: "Lilibet is my pride. Margaret is my joy," People reported.

Prince Philip was believed to be the last person who referred to the Queen by her nickname

Prince Philip, the Duke of Edinburgh, died on April 9, 2021, at the age of 99. He was reportedly the last person to call the Queen by her childhood name, People reported.

During his funeral, the Queen placed a handwritten note on his coffin and signed it with the nickname Lilibet, according to People.

Lili's middle name is a tribute to Prince Harry's mother, Princess Diana

Lilibet's middle name is a reference to her late grandmother, Diana, Princess of Wales.

Diana died in August 1997 after a car crash in Paris, France. Prince William was 15 years old at the time, while Harry was only 12.

Harry has been vocal about his mother and how her death greatly impacted his life. He's previously spoken about how difficult it was to cope with her death.

"One of the hardest things to come to terms with is the fact that the people who chased her into the tunnel were the same people that were taking photographs of her while she was still dying on the back seat of the car," Prince Harry said in the documentary, "Diana, 7 Days."

"William and I know that, we have been told that numerous times by people who know that was the case. She had quite a severe head injury but was still very much alive on the back seat and those who caused the accident instead of helping were taking photographs of her dying. And then those photographs made their way back to news desks in this country."

Prince William and Kate Middleton also honored the Queen and Diana with the birth of their second child and first daughter, Princess Charlotte Elizabeth Diana.