Earl Charles Spencer's warning resulted in Meghan and Harry adopting the "Sussex" surname, sources have claimed. The advice came after the Duke of Sussex explored changing his name to Spencer, his late mother's maiden name.

Prince Harry and Meghan Markle may change their children's surname to Spencer, reportedly due to passport delays linked to their use of the Sussex title and HRH styling., UK News - Times Now

Prince Harry, the Duke of Sussex, reportedly confided in his uncle, Earl Charles Spencer, Princess Diana's younger brother. He was advised against changing his last name to Spencer.