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.
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.
it is like yeah.
Too look after the family
Sapphire
Kate Middleton chose her sister Pippa to be her Lady-in-Waiting.
Kate Middleton was born on January 9, 1982
Kate Middleton's parents are Carole Elizabeth Middleton and Michael Francis Middleton.