Board Thread:Off Topic/@comment-27966940-20160712001717/@comment-25396609-20160718021713

I know.

During an early episode, one of the Achievement Hunter guys mixed up the flint and coal items in minecraft; this lead to shenanigans and eventually any time someone said either "flint" or "coal" another person would say "Flint Coal"

Thus the name came about, as further jokes and conversation about that sounding like a name; resulting in both Flynt Coal the huntsman/jazz-musician of RWBY, and Flynt Coal the private investigator of X-ray and Vav.