Karen Blixen and Julian Barnes both used pseudonyms in their works.
Karen Blixen Baroness Karen Christenze von Blixen-Finecke (née Dinesen; 17 April 1885 – 7 September 1962) was a Danish author who wrote works in Danish and English. She is best known under her pen names Isak Dinesen, used in English-speaking countries, and Tania Blixen, used in German-speaking countries. She also published works using the aliases Osceola and Pierre Andrézel.
Millennium (novel series) Millennium is a series of best-selling and award-winning Swedish crime novels, created by Stieg Larsson. The two primary characters in the saga are Lisbeth Salander, a woman in her twenties with a photographic memory and poor social skills, and Mikael Blomkvist, an investigative journalist and publisher of a magazine called "Millennium".