Karen Blixen and Julian Barnes both used pseudonyms in their works.
Julian Barnes Julian Patrick Barnes (born 19 January 1946) is an English writer. Barnes won the Man Booker Prize for his book "The Sense of an Ending" (2011), and three of his earlier books had been shortlisted for the Booker Prize: "Flaubert's Parrot" (1984), "England, England" (1998), and "Arthur & George" (2005). He has also written crime fiction under the pseudonym Dan Kavanagh. In addition to novels, Barnes has published collections of essays and short stories.
Julian May Julian Clare May (born July 10, 1931) is an American science fiction, fantasy, horror, science and children's writer who also uses several literary pseudonyms, best known for her "Saga of Pliocene Exile" ("Saga of the Exiles" in the United Kingdom) and "Galactic Milieu Series" books.