Franklin W. Dixon
Edward Stratemeyer was also behind the pseudonym Franklin W. Dixon, who is credited for writing the Hardy Boys series. In reality, a series of writers anonymously wrote the books under the pen name. The series was successful and its popularity has remained for about 9 decades.
Tokyo Rose
Tokyo Rose was the name that allied troops gave the English-speaking group of female radio broadcasters spreading Japanese propaganda during World War II. They earned a very negative reputation for their efforts in trying to demoralize troops. Iva Toguri, one of the members, was actually arrested for hate speech. However, a person named Tokyo Rose never existed.