Placeholder name
Placeholder names are names used as placeholder words, i.e., referring to things, places, or people, the names of which or of whom do not actually exist; are temporarily forgotten, or are unimportant; or in order to avoid stigmatization, or because they are unknowable or unpredictable given the context of their discussion; or to deliberately expunge direct use of the name. Placeholder names for people are often terms referring to an average person or a predicted persona of a typical user or for an individual whose name is unknown.