It was previously suggested that the most likely contender for Harry and Meghan's new title was the Duke and Duchess of Sussex. The only previous Duke of Sussex was married twice, but neither marriages were considered lawful by his father George III, meaning they were considered unlawful. It therefore stands that Meghan is the first woman to lawfully use the title, HRH The Duchess of Sussex. It was always expected that the Queen would bestow a title and dukedom upon her grandson, just like she did when Prince William and Kate tied the knot in April 2011. The couple were subsequently known as the Duke and Duchess of Cambridge. If the Queen hadn't had given Harry a peerage, he would have kept his title HRH Prince Henry of Wales, and his new wife Meghan would have been styled as HRH Princess Henry of Wales. SOURCE: Hellomagazine.com ---DECRYPTED---“The Queen has today been pleased to confer a Dukedom on Prince Henry of Wales. His titles will be Duke of Sussex, Earl of Dumbarton and Baron Kilkeel.
— Emily Nash (@emynash) May 19, 2018
Prince Harry thus becomes HRH The Duke of Sussex, and Ms. Meghan Markle on marriage will become HRH The Duchess of Sussex.”