The Duke of Sussex expressed interest in the name back in 2019.
Prince Harry and Meghan Markle announced the birth of their second child together, daughter Lilibet "Lili" Diana Mountbatten-Windsor, on Sunday.
Although the first name is a tribute to Queen Elizabeth, who was affectionally called Lilibet as a child by her family members, "Lili" had been on Harry's radar for quite some time.
The couple visited the town of Birkenhead back in 2019, when they were expecting Archie. During the outing, they heard name suggestions from a group of school children and Harry expressed interest in the name "Lily", asking a mother how she spelled it.
According to an official statement, Lilibet was born on Friday, June 4 in Santa Barbara, California.
"It is with great joy that Prince Harry and Meghan, The Duke and Duchess of Sussex, welcome their daughter, Lilibet "Lili" Diana Mountbatten-Windsor, to the world", the statement read. "Lili was born on Friday, June 4 at 11:40 a.m. in the trusted care of the doctors and staff at Santa Barbara Cottage Hospital in Santa Barbara, CA. She weighed 7 lbs 11 oz. Both mother and child are healthy and well, and settling in at home."