Larry, Moe and Curly
Aren’t you cheating? The fact that he ruled as Napoleon I is the main reason he is remembered simply as ‘Napoleon’. (As opposed to simply as ‘Bonaparte’.)
Perhaps not a hijack, but who would be the earliest that would only be known by two names?
Marc Anthony is the first I could think of.
Plrenty of Romans had a multiplicity of names. We just often use only one.Gaius Marius preceded Marcus Antonius by decades.
(Jeff) Vader?
Pharaoh Ameny Qemau preceded both of them by almost 2,000 years, so he’s probably got to be one of the earliest we know about.
Cher
Prince
Sting
Iman
Buddha
Godzilla
Merlin
I believe, to some extent, some of us are getting confused between people who are known by one name and those recognised by one name.
Patton may always be recognised by his surname but but to a lot of us will be more known as George Patton.
Is (Reginald) Jeeves acceptable?
Confucius.