I don't think she officially has one any more. Royals don't have surnames. Harry was born His Royal Highness Prince Henry of Wales and used Wales as a surname when in the military. He is now Prince Henry, Duke of Sussex and so she is Meghan, Duchess of Sussex.
Anyway, back on topic, overall, I like her and feel like she was treated unfairly. I think there's no way any American really knows what they're walking into with the royals and Harry did not prepare her well enough at all. I don't blame them for wanting out and I think I'd want my say too. The "Never complain, never explain" only really benefits those at the top of the tree.