nom de plume

 
Pronunciation: /ˌnɒm də ˈpluːm/

noun (plural noms de plume pronunc. )

  • an assumed name used by a writer instead of their real name; a pen-name: she is better known under her nom de plume of Daniel Stern

Origin:

early 19th century: formed in English from French words, to render the sense 'pen name', on the pattern of nom de guerre