Nadad is the contreversial word for a dad that has left his family after impregnating the woman, leaving her to raise the child alone. Nadad is derived from "Not Associatable" and dad.

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. (sometimes written as two words: dead name)

v. 1. To call somebody by their deadname.
v. 2. To out somebody's deadname to the public.