Markdown is Gruber's thing. Github Flavored Markdown means “Gruber's thing, but with some GitHub things added”; and that's what it is. Standard Markdown means

Markdown is Gruber's thing. Github Flavored Markdown means “Gruber's thing, but with some GitHub things added”; and that's what it is. Standard Markdown means “the main/real/most-widely-used Markdown”; but it's none of those things. Common Markdown means almost exactly the same thing. If Standard Markdown is not okay, neither is Common Markdown. Gruber suggested “Strict Markdown” or “Pedantic Markdown”. These names clearly describe how the project differs from Gruber's thing. This has very little to do with whether the name contains the word “Markdown”. It's about semantics; describing what this thing is. Also, prematurely calling something Standard or Common is a classic mistake.