Meghan Markle and Prince Harry could pay tribute to his late mother and call their baby girl Diana, a royal expert says.
The Queen and other senior royals will be thrilled for the Sussexes, but the birth will bring some sadness because they won't know the child as well as Prince William and Kate's children, biographer Angela Levin added.
During their bombshell interview with pal Oprah Winfrey, the Duke and Duchess of Sussex revealed the happy news they are expecting a girl, who is due in the summer.
Meghan, 39, and Harry, 36, said their daughter, a sister to their son Archie, will complete their family, with the duchess adding: "Two is it."
Speculation is rife over what they could call their secondborn, with some observers and fans saying Diana as a first or middle name would be a wonderful tribute to Harry's late mother.
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Diana, Elizabeth, Alexandra and Grace are among the bookies' favourite names. Meghan's mother's name is Doria, but bookies think it is a longshot.
Royal expert Ms Levin, author of Harry: Conversations with the Prince, told the Mirror: "I'm sure they will call her Diana.
"I think Harry would love that, and Meghan would be very proud because she would bring Diana close to him.
"What would be extraordinary is if the baby was born within a few days of the unveiling of Diana’s statue in the summer."
A statue of the Princess of Wales, commissioned by her sons Harry and Prince William, is due to be installed on July 1, on what would have been her 60th birthday, in the Sunken Garden at Kensington Palace.
Last week, sources told Russell Myers, the Mirror's royal editor, that William and Harry are prepared to "put on a united front" and stand together at the unveiling of a statue to their mum.
As for a baby name, Ms Levin wouldn't be surprised if the Sussexes opt for a modern name or follow the method they used when they named Archie, who turns two in May.
She said: "I don’t think they will use a royal name that has been part of the name of a previous royal who is no longer with us.
"They could try to find something maybe in Greek that will let them have another foundation.
"Archie was taken from a Greek word."
After Archie's birth in May 2019, the Sussexes revealed the Greek word "arche", meaning "source of action", was the inspiration behind their firstborn's name.
The Sussexes have named their video and podcast companies Archewell.
After having a son, royal fans wondered if Meghan and Harry were secretly hoping for a girl.
Harry told Oprah his first thought was "amazing" when he discovered the gender of his unborn child, adding: "Just grateful. To have any child, any one or any two, would have been amazing.
"But to have a boy and then a girl, I mean, what more can you ask for? Now we've got our family, we got the four of us and our two dogs."
Ms Levin said: "I think Meghan's age means she would be delighted to have a child that is very healthy.
"There’s always a belief that if you have two children of the same sex they can play with each other and be very close, for example like Harry was with William.
"The main thing is, particularly if she will be 40 or almost 40 (when she gives birth), that the child is well."
Meghan, who turns 40 in August, bravely revealed that she suffered a miscarriage in July last year, writing in the New York Times of feeling "an almost unbearable grief".
"I knew, as I clutched my firstborn child, that I was losing my second," Meghan wrote.
She told how she watched "my husband's heart break as he tried to hold the shattered pieces of mine".
Ms Levin said the Queen and other senior royals will be thrilled for the Sussexes when the baby - the monarch's tenth great-grandchild - is born, but their excitement is likely to be tinged with sadness.
She added: "They will be delighted on Harry's behalf because he is marvellous with small children and he has always wanted to have children.
"But there will be a sadness that they won’t know this child in any way like they do with William and Kate’s children.
"But that’s what happens when a couple live far away.
"Luckily, there is Zoom and they may be able to get glimpses, but it’s not the same. You can’t build up a relationship over Zoom.
"As for the children, I think it's a tragedy that they won’t know Harry’s family."
It is said that the Queen, 94, and husband Prince Philip, 99, haven't seen Archie in person since the autumn of 2019. But Harry has told how they stay in touch and see Archie on video calls.
Harry previously revealed in Vogue magazine he plans to have two children at most as he described his concerns about the future of the planet.
It came during a conversation with legendary ethologist and activist Dr Jane Goodall for the September 2019 issue, which was guest-edited by Meghan.
Dr Goodall asked Harry how many children the couple would have, and he replied: "Two, maximum".
In their interview with Oprah earlier this month, Meghan confirmed: "Two is it."
But Ms Levin said: "You never know because once you've had a child you may also want another one for them, and then you sort of get used to it and think, 'I might as well have a third'."
Leading up to and after the birth, Los Angeles-born Meghan and Harry - who have signed multi-million pound deals with Netflix and Spotify - are expected to have some help from hired experts and family, such as the duchess' mum Doria, 64, who lives nearby.
Ms Levin said it's possible the Sussexes will have more help around them after this birth, given they will have two children to take care of while running a business and doing charity work.
She said: "Meghan’s mother will want to help them and be involved, and the second one will be very close to her.
"I think (Meghan) will rethink those early weeks (after Archie's birth).
"First-time mothers think they can do everything themselves.
"She might well have a night nanny and day nanny to help her, particularly if she is working.
"You can’t juggle two in the same way that you can juggle one.
"I imagine a lot of money will come rolling in before she gives birth. They will be able to afford it."
The Sussexes, who quit as senior royals a year ago, made a series of bombshell claims to Oprah about their time as senior royals.
Former Suits actress Meghan said she had thoughts of suicide and claimed a member of the Royal Family had made a racist comment about Archie's skin colour before he was born in May 2019.
Winfrey asked if her son being "too brown" would be a problem, and Meghan replied: "If that is the assumption you are making, that is a pretty safe one".
She and Harry declined to reveal who had "concerns" about the colour of Archie's skin, but the duke told Oprah off camera that it wasn't the Queen or Philip.
Harry told how he felt "really let down" by his father Prince Charles, 72, following Megxit, and confirmed the rift with his older brother William, 38, continued, but he hoped to mend both relationships.
Meghan addressed claims she had made Kate cry during a dress fitting ahead of the royal wedding, and alleged the "reverse" happened and that it was Kate who made her cry.
She claimed Kate "owned it" and apologised with flowers and a note "to take accountability".
