When Charlotte and her older brother Prince George attended Thomas's in Battersea, before the family moved to Windsor, they were not known by their royal titles.
Instead they used their parents' titles, which at that time would have been the Duke and Duchess of Cambridge, meaning their children were referred to at school as George and Charlotte Cambridge.
Now they have been joined by their younger brother Prince Louis at Lambrook School in Windsor, where they are likely known as the Wales children as their parents have become the Prince and Princess of Wales.
Princess Charlotte’s full name is Charlotte Elizabeth Diana, and her full official title is Her Royal Highness Princess Charlotte of Cambridge.
It is not unusual for children to use their parents' royal title as a surname at school, as it was the same for Prince William and Prince Harry.
When the boys attended school at Ludgrove and Eton, they were known as William and Harry Wales after their father, who was then Prince of Wales.
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Charlotte, George and Louis all attend Lambrook (Image: Getty)
Kate too refers to her daughter by a diminutive name, as on a trip to Northern Ireland in 2019 a woman called Laura-Ann heard the Princess call her 'Lottie'.