When I ported Markdown to mod_perl and a CMS I was working with about 9 or so years ago, I emailed John, and he indicated " just don't use the 'Markdown' name", so I choose "Makeup" (it makes things pretty). You're welcome to reuse that name @codinghorror. It seems clear to me avoiding "Markdown", whether you precede it with Vanilla, Humble, Common, Friendly, or whatever is really just a waste of time and likely to cause unnecessary tension. Makeup, man. Makeup. The name could also be your public deferential gesture to John, so you can all - Makeup.
Just for your information, CodingHorror is just the name of the blog. The writer uses its real name: Jeff Atwood. It is therefore better to use it directly.