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A form of Names to Run Away from Really Fast: Anything that sounds like it belongs to a proud resident of the Deep South can indicate someone badass, Ax-Crazy, rapey, racist or otherwise seriously disturbed.

Examples:

Carnage's real name is Cletus Kasady.
The Authority: Seth Angus Bubba Joe Billy Cletus Clement Callum Cowie. His mother named him after all of her brothers, because she wanted to be sure to name him after his father.
Empowered has Willy Pete. He's Ax-Crazy, rapey, and on fire, the last of which makes more sense when you find out his name is also a nickname for white phosphorous.
Billy Bob and T.C. from Preacher. The former is a kid so inbred he has only one eye, and the latter is a murderous Jerkass who'll screw just about anything.
In Daredevil and Jessica Jones, the Purple Man's real name is Zebediah Killgrave, even though he was born in Croatia. The 2015 Netflix series averts this — he only goes by "Kilgrave" (with only one L), which doesn't give off a redneck vibe on its own, and his real name is Kevin Thompson.

Pulp Fiction: Zed and Maynard are repulsive redneck rapists, with names to match.
Budd and Buck from Kill Bill
The killer in The Nail Gun Massacre turns out to be a guy named Bubba.

In Cody Goodfellow's short horror story Life Coach, her psychotic, vicious dog's name is "Clovis".
Billy-Ray Sanguine from Skulduggery Pleasant, a sociopathic hitman who carries a special straight razor with which to cut his victims' throats.

Buffy the Vampire Slayer 's season 6 Big Bad is named Warren Mears, which kind of foreshadows his future mental instability. (Of course, ironically, the actor's a Jew from New York, although his chick's from Alabama, but she's definitely not a redneck. And she's the one he shot.)
On The Shield, Shane Vendrell is not a nice person. Further, he uses the alias "Cletus van Damme".

Luther-Dwayne Grady from SSX Tricky. He's a gigantic and rude guy whose play style revolves around using his massive size to his advantage.