Also to clarify:

I don't mean to imply that African Americans made up the name "Devon".

"Devon" may come from the Irish Gaelic Devin [meaning poet, savant].
I've also seen "Devin" listed as {Latin/French-Heavenly" .

Though "Devon" may be a variant of "Devin", "Devonte", "Devontae", Devontay etc are definitely male names of contemporary [post 1970s] African American origin.

BTW, I've usually heard "Devon" pronouned DAY-vaun' with the "von' rhyming with Shaun {which name I believe is responsible for it's promotion}, since one of the foremost ways we {African Americans} create names is by rhyming...Hence "Shaun" gave energy to the use of the name "Devon" which may have help birth Trevon {TRAY-vaun}; Trevonte, Trevontae etc. {seeing how many ways to phonetically spell an ending is also a biggy with us}

And speaking of "Shaun", my theory is that the name "Shaun" became very popular with African Americans as a result of the popularity of the 007 spy movies in the 1960s and on. Sean Connery was the actor who played 007. Since "Sean" doesn't conform with phonetic spelling, that spelling was changed to "Shaun" and "Shawn" and then "Shon".

And there are umpteen "Shaun", "Shon", and "Shawn" names for males and females. Just play with prefixes, add a suffix, capitolizations and maybe throw in an accent mark and-you've created a new name {that just happens to be the same as countless other new names, but oh well!}