And why do we still call her Kate Middleton? Does she not have a new name after marring the Prince William of Wales?
"" When Diana married Prince Charles, she was known as Princess Diana and she still is today, a decade after her death. Kate wasn’t given the title “Princess” by the queen due to her commoner background. Kate Middleton got the “Duchess” title, but it is Duchess of Cambridge, which doesn’t contain the name for which she’s known around the world and the one that everyone is so used to, “Kate.”
Author Barbara Hannah Gufferman was asked to comment on Kate being called by her maiden name still today and she said:
“Kate Middleton is seen more as a whole person; [she] established an identity for herself, so it's harder to separate that from her name."
Barbara is right, it is Kate’s full identity and she is very established under this name, so it would be hard to train the public to call her by any other name.
While Kate’s been under the microscope for almost every move she’s made since joining the royal family, debating if it is appropriate to still call Kate by her maiden name was bound to come up sooner or later.
The consensus seems to be that it is perfectly fine to continue referring to the woman who is really a princess, Kate Middleton! How much easier it would have been if the Queen just threw all caution to the wind and gave Kate that coveted princess title. Calling her Princess Kate would have been much more traditional when it comes to being married to a prince.""
Source - http://www.examiner.com/article/kate-mi ... re-to-stay