Necronym

n. The birth name of somebody who has changed their name. Most commonly attributed to trans people, but can be attributed to any person who has changed their name. (See: dead name)

v. 1. To call somebody by their necronym.

v. 2. To out somebody's necronym to the public.

Don't call her by her necronym . She hasn't gone by that name in years.

Necronym

A much more bourgeois sounding word for deadname. A necronym is the name being replaced (usually their birth name) by a transgender person. Derived from "Necro" meaning dead and "nym" meaning name, as in pseudonym. Sentence:

"Sally almost outed Grace by calling her by her necronym."