Since you are from the UK does say Prince Charles have a last name like most people or is royalty only known by their titles say for example
The Duke of Windsor-

The Royal Family take a surname for use in 'normal' life. Her Majesty the Queen was Elizabeth Windsor when she was Princess Elizabeth and working as an 'ATS girl'(ATS= Auxiliary Transport Service) in the War,Prince Harry is Harry Wales in his military service, and so on.The surname Windsor was used because King George V declared that his family would be the House of Windsor as would all male descendants of Queen Victoria. When Prince Charles became Prince of Wales and had children the family opted for Wales as a surname rather than Windsor or his own father's name, Mountbatten.

When Princess Anne married a commoner she was instantly the owner of a new surname. She became Mrs Mark Phillips. Her children are Peter and Zara Phillips. She is now Mrs Tim Laurence .

Of course, at least one king kept his civilian surname. Henry VII started out as Henry Tudor, Tudor being his surname, but became king in battle. He became King Henry VII of the House of Tudor. (King George V had been one of the family of Saxe Coburg Gotha but had his family name changed to Windsor in 1917, during the Great War, because the original name was too German ).

Fred, the information below, from http://www.royal.gov.uk/output/Page5657.asp, seeems to disagree with what you say. Having said that, I am aware that one of Elizabeth's children has produced films using the last name Windsor.



The Royal Family name of Windsor was confirmed by The Queen after her accession in 1952. However, in 1960, The Queen and The Duke of Edinburgh decided that they would like their own direct descendants to be distinguished from the rest of the Royal Family (without changing the name of the Royal House), as Windsor is the surname used by all the male and unmarried female descendants of George V.

It was therefore declared in the Privy Council that The Queen's descendants, other than those with the style of Royal Highness and the title of Prince/Princess, or female descendants who marry, would carry the name of Mountbatten-Windsor.

This reflected Prince Philip's surname. In 1947, when Prince Philip of Greece became naturalised, he assumed the name of Philip Mountbatten as a Lieutenant in the Royal Navy.

The effect of the declaration was that all The Queen's children, on occasions when they needed a surname, would have the surname Mountbatten-Windsor.

For the most part, members of the Royal Family who are entitled to the style and dignity of HRH Prince or Princess do not need a surname, but if at any time any of them do need a surname (such as upon marriage), that surname is Mountbatten-Windsor.
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House of Windsor (Feb 8, 1960)

At the Court at Buckingham Palace, The 8th day of February 1960.
Present, the Queen's Most Excellent Majesty in Council.

Her Majesty was this day pleased to make the following declaration:
"My Lords
Whereas on the 9th day of April 1952, I did declare in Council My Will and Pleasure that I and My children shall be styled and known as the House and Family of Windsor, and that My descendants, other than female descendants who marry and their descendants, shall bear the name of Windsor:
And whereas I have given further consideration to the position of those of My descendants who will enjoy neither the style, title or attribute of Royal Highness, nor the titluar dignity of Prince and for whom therefore a surname will be necessary:
And whereas I have concluded that the Declaration made by Me on the 9th day of April 1952, should be varied in its application to such persons:
Now therefore I declare My Will and Pleasure that, while I and My Children shall continue to be styled and known as the House and Family of Windsor, My descendants other than descendants enjoying the style, title or attribute of Royal Highness and the titular dignity of Prince or Princess and female descendants who marry and their descendants shall bear the name of Mountbatten-Windsor."

(London Gazette, issue 41948, Feb. 8, 1960, p. 1/1003. See also the Times Feb 9, 1960 p. 10E.)

Internet Source: http://www.heraldica.org/topics/britain/prince_highness_docs.htm#1960

DG, this rule has evidently been abandoned in practice, the decision being made by the individual.Princess Anne was first married under the name Mountbatten-Windsor. However, the Queen's youngest son, Edward, Earl of Wessex, styles himself Edward Windsor, not Edward Mountbatten-Windsor and Prince Charles' boys style themselves Wales not Mountbatten-Windsor.

This link hints that the Queen herself has said that this proclamation is not binding:

Windsor

Evidently it isn't . She would surely have complained if her own son and grandson were not using the name.It may be that the last paragraph of the proclamation is meant to be read as 'anyone who is a Prince or Royal Highness can use something else'. It appears to mean only that a Prince James would not be called Prince James Mountbatten -Windsor but HRH Prince James of Windsor.

Whichever Prince was just in Iraq also went by Windsor. (We have now reached the limit of my knowledge of the British Royal Family.)

What is not so widely known is that Her Majesty is known as Brenda.

This is the name for her used by Private Eye magazine for many years.They got it from staff in Buckingham Palace, whose nickname for 'Her Maj' it was. Explanation of why Brenda is so apt would take a lot of typing. It's founded in the image of, and social class associated with, certain names.It suggests a certain age, type and class of individual.