Prince William Surname: Mountbatten-Windsor Wills was born Prince William Arthur Philip Louis Windsor on 21 June 1982, and his official title was His Royal Highness Prince William of Wales. The name Wales comes from the area over which his father holds title. Following his marriage to Kate Middleton in 2011, he became the Duke of Cambridge, Earl of Strathearn and Baron Carrickfergus. During his military service, William used the name Wales, known as Captain William Wales.
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 …
Catherine, Duchess of Cambridge Surname: Mountbatten-Windsor, by marriage When Kate Middleton married Prince William in 2011, she became known as Her Royal Highness Catherine, The Duchess of Cambridge, Countess of Strathearn and Lady Carrickfergus. William and Kate's children are known as Prince George Alexander Louis of Cambridge, born on July 22, 2013 and Princess Charlotte Elizabeth Diana of Cambridge, born May 2, 2015.
Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Princess Charlotte of Cambridge and Prince George of Cambridge talk to Queen Elizabeth II, Prince Phillip, Duke of Cambridge and Camilla, Duchess of Cornwall arrive at the Church of St Mary Magdalene on the Sandringham Estate for the Christening of Princess Charlotte of Cambridge on July 5, 2015 in King's Lynn, England.