pseudonym
The five diarists are pseudonymous and their real names cannot be revealed.
Some names have been changed, and readers will have fun guessing who the pseudonymous characters represent.
His client was the pseudonymous Jane Roe.

SMART Vocabulary: related words and phrases

Names and titles
A.N. Other
age
aka
alias
appellation
first name
forename
form of address
given name
good name
pen name
pet name
place name
pseudonym
pseudonymity
unchristened
under the name ofidiom
unidentified
unnamed
untitled