Fnu Lnu is a pseudonym used in law enforcement to indicate that a person's name is not known. The origin of the name is the acronym First Name Unknown, Last Name Unknown. In the situation where only the first name or last name is known, variants such as "John Lnu" or "Fnu Smith" are used. A pseudonym (Greek: false name) is a fictitious name used by an individual as an alternative to his or her legal name. ... For the band, see The Police. ... It has been suggested that this article or section be merged with Backronym and Apronym (Discuss) Acronyms and initialisms are abbreviations, such as NATO, laser, and ABC, written as the initial letter or letters of words, and pronounced on the basis of this abbreviated written form. ... A given name specifies and differentiates between members of a group of individuals, especially a family, all of whose members usually share the same family name. ... A family name, or surname, is that part of a persons name that indicates to what family he or she belongs. ...