User blog comment:Takeshi kun21/What is your Name?: Guide to Naming Your RWBY OC/@comment-31277579-20180515171318/@comment-8182065-20180516104518

So, because something is dull, doesn't mean its colorless.

And a matte is just something dull or lusterless (can be surfaces like metals and glass, as well as paint). Even though the word can be associated with a type of paint, there's no specification as to which color, so it doesn't work as a name by itself IMO.

As far as the Fanon is concerned, First/Whole names work for the CNR, so something like Matte Blake or Matte Steel would work (referencing black matte paint and dulled steel respectively).