Everyone calls the Duchess of Cambridge Kate, but her real name is Catherine
The famous royal was christened Catherine Elizabeth Middleton. The more informal moniker version of 'Kate' was used by some friends growing up. This shorter, snappier name presumably stuck after being called it by friends at school, but everything changed when Kate became the Duchess of Cambridge after tying the knot back in 2011.
When she married Prince William at Westminster Abbey 11 years ago, the Duchess of Cambridge then reportedly urged her friends to start using her full name again as she had been trying to rid herself of the 'Kate' identity for some time before that. And although it may seem trivial, there was some quite sad reasoning behind her desire to ditch 'Kate'.