Technically, the royal family does not use surnames. Surnames are thought to be used by commoners. Therefore, the royals use titles.
Prince William's title is His Royal Highness Prince William of Wales. Many are assuming Kate Middleton's title will be Princess Catherine of Wales. However, the Queen may bestow any title she wishes, so we will have to wait for the announcement from her to know for sure.
That all being said, Kate Middleton is marrying into the House of Windsor, so if she did want to use a last name it would be Windsor.
Royalty do not use last names in the traditional sense. When last names are necessary, such as in marriage, Prince William, Prince Harry, and the other descendants of Elizabeth II and Prince Philip are to use the name Mountbatten-Windsor. This means that Kate's last name is Mountbatten-Windsor, her full name is Catherine Elizabeth Mountbatten-Windsor, but she will be known by her title, the Duchess of Cambridge.
Royals do not use last names, but when one is used, it will be Mountbatten-Windsor.
First, it's Cambridge, but that's not their last name. It's actually Mountbatten-Windsor
Middleton was her surname before getting married.
Duchess Catherine of Cambridge.
Mountbatten-Windsor
Prince William
Carole Elizabeth Middleton (nee Goldsmith) is Kate Middleton's mothers name.
Catherine Elizabeth Middleton
in massachusetts
Mountbatten-Windsor
ElizabethHer full name is Catherine Elizabeth Middleton.
Too look after the family
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Kate Middleton chose her sister Pippa to be her Lady-in-Waiting.
Kate Middleton's parents are Carole Elizabeth Middleton and Michael Francis Middleton.
Kate Middleton was born on January 9, 1982