DB Cooper was the name of a suspect in the case that was found to be innocent. Everybody simply calls the perpetrator DB Cooper because that's what the media called him.
Not sure if you're counting temporary disappearances but Agatha Christie once went missing for 11 days. The exact reason is unknown; some think it was a publicity stunt while some think it was a legitimate breakdown caused by the deterioration of her marriage, since she claimed to have no memory of her time missing, and two doctors believed this to be true following examinations. Either way, the way she suddenly vanished caused a massive manhunt and a massive news story (which some think was overblown).
This is a very notable story, but yeah I was just doing permanent disappearances. The number of temporary disappearances of famous people would be a much longer list.
Roanoke shouldn't be included. If you want to still include it then Virginia Dare (First person to be born in America outside of natives) could work as she was in the Roanoke Colony
Lord Lucan and Glenn Miller also vanished without trace.
DB Cooper was the name of a suspect in the case that was found to be innocent. Everybody simply calls the perpetrator DB Cooper because that's what the media called him.