Charles, Prince of Wales - "Surname"

Looks like that's been corrected today.

Charles, Prince of Wales is my 9th cousin twice removed.

I have been aware of this issue.

Vanda Purik-Järvinen

It's Mountbatten-Windsor, see:

https://www.cornwalllive.com/news/uk-world-news/what-prince-charles...

Note that since the death of his father, he also inherited his titles and became the Duke of Edinburgh.

Mary Queen of Scots Scotland R-M269 Mary McGann is her last name

These are places not last names, Winsor and Mountbatten not last name just a place

Lord Bruce De UBC

Royalty as we know or some people don't know is they named themselves after the Dynasty and /or the place where they lived, what is the real last name, lol

Lord Bruce De UBC

Hello

Mary McGann was the only child of Henry McGann VIII by his first wife, Catherine of Aragon

Lord Bruce De UBC

Henry McGann VIII was King of England from 22 April 1509 until his death in 1547. Henry McGann is best known for his six marriages, including his efforts to have his first marriage annulled. His disagreement with Pope Clement VII about such an annulment led Henry McGann to initiate the English Reformation,

Separating the Church of England from papal authority

Lord Bruce De UBC

Enno Borgsteede, certainly a declaration from the Queen is a better source to cite than Cornwalllive.com. Both the 1960 announcement and the quote in your article say that Mountbatten-Windsor is for Queen Elizabeth's and Prince Philip's descendants who are not Royal Highnesses. Prince Charles is a Royal Highness, therefore he is of "the House and Family of Windsor." Furthermore, he did not use Mountbatten-Windsor in his wedding register. Despite being Royal Highnesses, his three siblings did all use Mountbatten-Windsor.

The original announcement in the London Gazette
https://www.thegazette.co.uk/London/issue/41948/supplement/1003

A list of announcements, Letters Patent, etc. regarding British Royal titles and styles.
https://www.heraldica.org/topics/britain/prince_highness_docs.htm

OK, here's the official part on their own site:

https://www.royal.uk/royal-family-name

which says:

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.