Harry will hold several titles: His Royal Highness The Duke of Sussex, Earl of Dumbarton and Baron Kilkeel. Markle will be known as Her Royal Highness The Duchess of Sussex.
Titles are decided by the Queen when a relative either comes of age or gets married, CNN reported. The queen can choose from five titles for a man, CNN reported -- duke, marquess, earl, viscount or baron. For a woman, the choices are duchess, marchioness, countess, viscountess and baroness.