Article continues below advertisementKing Charles gave Meghan Markle a very unique nickname during her time as a senior member of the royal family, a new book claims. According to Russell Myers' tome, William & Catherine: The Intimate Inside Story, the sovereign's moniker for the Duchess of Sussex, 44, before she left the Firm in 2020, alluded to her strong wit and fortitude.Article continues below advertisementSource: MEGAKing Charles' nickname for Meghan Markle was 'Tungsten.