Lewis Carroll, best known as the British author of Alice’s Adventures in Wonderland, was the nom-de-plume of Charles Lutwidge Dodgson.
(A nom-de-plume is an assumed name used by a writer instead of their real name, aka a pen-name, not to be confused with the following:-
pet name: a name that is used instead of someone's usual first name, usually to express fondness.
nickname: a familiar or humorous name given to a person or thing instead of or as well as their real name.)