1706 (in pseudonymous), from Fr. pseudonyme (adj.), from Gk. pseudonymos "having a false name," from pseudes "false" + onyma dial. form of "name." Properly of made-up names; the name of an actual author or person of reputation, affixed to a work he or she did not write, is an allonym. An author's actual name affixed to his or her work is an autonym (1867). Pseudonymous first recorded 1706.