Pseudonymous

[Sommer]

An adjective derived from [Pseudonym]:

A word to describe a fake or [fictitious] name. From some long [greek] word meaning falsely named.
Can be used as a referal to someones name as an indication of how fake they are.

[Dianne]

Writing or written under a false name.

[Merna]

using or given a false name, for example as a writer: