slave name

noun2

1. •
   A name or surname given to a person held in slavery, or passed down to their descendants.

   • They might not know which name to call—my slave name, Marie Laveau, or the unknown African name that should've been mine. — 1995
2. •
   (disapproving) Any name imposed on one by others rather than chosen by them for themselves (but generally excluding names bestowed by one's parents).

   • 'Woman' is my slave name; feminism will give me freedom to seek some other identity altogether. — 1989