Prince William’s birth certificate shows that his name and surname is His Royal Highness Prince William Arthur Philip Louis. So he does not have the Mountbatten-Windsor surname on his birth certificate.

Prince William's birth certificate, heir to the Heir to the British Throne shown here. Diana Spencer doesn't have a first name in this record!

'My grandma is incredible,' says Prince William in exclusive, unprecedented and…

'My grandma is incredible,' says Prince William in exclusive, unprecedented and candid interview with author and journalist Robert Hardman

Queen Elizabeth II, Princess Margaret, Princess Diana, Prince William and Prince Harry on balcony at Buckingham Palace

hrhduchesskate: Wedding of Philippa Middleton and James Matthews, May 20, 2017-The Duke of Cambridge and Prince Harry

hrhduchesskate: Wedding of Philippa Middleton and James Matthews, May Duke of Cambridge and Prince Harry

What Is Prince William’s Surname And Could The Royal Baby Take His Last Name?

Prince William Photos - Prince William, Duke of Cambridge attends the Order Of The Garter Service at St George's Chapel on June 2013 in Windsor, England. - The Order of the Garter Service in Windsor

The Duke of Edinburgh and Prince William were also at the ceremony, where they smiled at each other during a conversation this morning

The Royals arrive at site where Magna Carta was granted 800 years ago

Prince Philip, Duke of Edinburgh chats to Prince William, Duke of Cambridge at a Magna Carta Anniversary Commemoration Event on June 2015 in Runnymede, United Kingdom

Prince George arrives with his father Prince William, Duke of Cambridge at Thomas's Battersea in London, U.K., as he starts his first day of school on Sept. 7, 2017. - Richard Pohle/The Times/PA Wire/PA Images

Prince George arrives with his father Prince William, Duke of Cambridge at Thomas's Battersea in London, U., as he starts his first day of school on Sept. - Richard Pohle/The Times/PA Wire/PA Images

The royal baby‘s surname is unclear at this point, but it could be Mountbatten-Windsor. Prince William and Duchess Catherine typically don’t use the surname, because of the titles before their first names. George V in 1917 declared that Windsor …

Britain's Prince William and his wife Catherine, Duchess of Cambridge appear with their baby son outside the Lindo Wing of St Mary's Hospital, in central London July REUTERS-Andrew Winning

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