A person who has a sexual fetish or fetish in general for Native Americans. "Rez" is short for Reservation which is where they tend to live on.

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.