Princess Beatrice paid tribute to her mother Sarah Ferguson when she named her newborn daughter Sienna, a family friend claims.

The Queen’s granddaughter, 33, gave birth to a girl at the Chelsea and Westminster Hospital at 11.42pm on Saturday, 18 September.

The newborn, who is 11th in line to the throne, is also a 12th great-grandchild for the Queen and a second grandchild for Prince Andrew and Sarah Ferguson.

On Friday, Beatrice and her husband Edoardo Mapelli Mozzi revealed they have named their baby daughter Sienna Elizabeth Mapelli Mozzi.

In a personal tweet, Beatrice shared a photo of the baby’s footprints accompanied with the caption: “Her Royal Highness Princess Beatrice and Mr Edoardo Mapelli Mozzi have named their daughter Sienna Elizabeth Mapelli Mozzi.”

The child’s middle name is a tribute to the monarch, matching her second cousin Princess Charlotte who also has it as her middle name.

But her first name was chosen in honour of Beatrice’s mother, a family friend told Hello!, explaining that Beatrice wanted to pick a title beginning with S and one which reflected the “golden rust colour of the Duchess's hair, which the new baby shares.”

“They were looking for an Italian name which started with an S for Sarah, to honour the duchess, and also reflected the golden rust colour of both the duchess's hair colour and Beatrice's which the new baby shares,” the source said.

The royals are known for picking sentimental names for their children. Her younger sister, Princess Eugenie, picked August and used Philip as the middle name, a tribute to her late grandfather the Duke of Edinburgh.

Beatrice and Edo’s announcement followed weeks of speculation over what they might call their 6lb 2oz newborn and who they might decide to pay homage to in their choice.

Beatrice’s own name is believed to have been changed shortly after she was born, as traditionally royals usually first tell the Queen about their name choice in an "informal chat" where it's hoped she gives her blessing.

When Prince Andrew and Sarah Ferguson welcomed their first child in August 1988, Beatrice’s name was changed from Annabel because the Queen felt it was too “yuppie”, the Sun reports.

Instead, the Monarch suggested Beatrice, believed to having taken inspiration from the name of Queen Victoria's youngest daughter, while her middle names - Elizabeth Mary - are a tribute to her grandmother and great-grandmother.

Sienna is Bea's first child and a second for Edoardo, who already has a young son, Christopher, also known as Wolfie, from a previous relationship.

While her position of 11th in line to the throne means the baby girl won't HRH title from the Queen, the baby will get a unique title thanks to Edoardo, who is an Italian count. This means any of his children will also inherit a count or nobile donna.

Edo also shared the footprint picture on his own Instagram account, writing: "Sienna Elizabeth Mapelli Mozzi. Our life together has just begun, and I can’t wait to see all the amazing things that await us.

"Feeling so much love and gratitude for my amazing wife, baby Sienna and Wolfie. These are the days I never want to forget. This week, a friend said to me the sweetest saying….that with every child you grow a whole new heart.

"A massive thank you to the Midwife and the amazing team at the Chelsea and Westminster Hospital."