Deadname definition.
deadname noun
dead·name | \ ˈded-ˌnām
variants: or less commonly dead name
plural deadnames also dead names
Definition of deadname
The name that a transgender person was given at birth and no longer uses upon transitioning Many trans people will go to great lengths to prevent people from finding out their deadnames, destroying irreplaceable photos and documents in an effort to ensure that who they really are is the only identity most will remember.
https://www.merriam-webster.com/dictionary/deadname