Affiant

AFFIANT

Noun. US. Early 19th century. 

[Old French afier, (later aff-) from medieval Latin affidare to trust]

LAW. A person who makes an affidavit. 

I always like finding out I'm something that I didn't know I was. Specifically, I didn't know I was an affiant. As someone that worked closely with the legal profession for ten years, I regularly had to make affidavits; therefore, I was an affiant. It also has a rather charming etymology. Nice.