Duchess Meghan's Trademark Gets Denied, Rejected as Her Brand Idea Suffers Big Setback via @WestJournalism [westernjournal.com]
She is not a duchess or she is not a US citizen as it is illegal for American citizens to hold a royal title.
Meghan, Duchess of Sussex is an American member of the British royal family and a former actress. She is married to Prince Harry, Duke of Sussex, the younger son of King Charles III. Meghan was born and raised in Los Angeles, California. Her acting career began at Northwestern University. She played the part of Rachel Zane for seven seasons in the American TV legal drama Suits. She also developed a social media presence, which included The Tig, a lifestyle blog. Wikipedia
@JohnBurke I always thought this applied to all Americans. But looking it up, it only applies to those holding office, or those employed by the government [en.wikipedia.org]