simply put;
a·non·y·mous
/əˈnɒnəməs/
[uh-non-uh-muhs]
-adjective
1. without any name acknowledged, as that of author, contributor, or the like: an anonymous letter to the editor; an anonymous donation.
2. of unknown name; whose name is withheld: an anonymous author.
3. lacking individuality, unique character, or distinction: an endless row of drab, anonymous houses.
rex
[reks]
-noun
1617, from L. rex (gen. regis) "a king," related to regere "to keep straight, guide, lead, rule," from PIE base *reg- "to rule, to lead straight, to put right" (cf. Skt. raj- "king;" O.Ir. ri, gen. rig "king;"
.