A form of Names to Run Away From Really Fast: Usually, this is the extremity they'll hit you with, or the one that's the most scarred. Blood, talon, skull, fang.
The Bloody Baron from the Harry Potter series, as well as a vampire named Sanguini.
Averted in the second series of Welkin Weasels novels, where one of the main characters is named Bryony Bludd, which is lampshaded by (wouldn't you know it?) a vampiric stoat. It's still a Meaningful Name, though; she's a veterinary surgeon (which within the series actually means a doctor to her fellow Talking Animals).
Rafael Sabatini's famous pirate, Captain Blood, started his career as Doctor Blood. It works either way! Notably, he was not bloodthirsty at all, and was a complex and sensitive man, so his name had a touch of irony to it... Which was completely lost in the movie, turning him into an uncomplicated badass with an entirely appropriate name.
The crimelord who forms the main antagonist in Gene Wolfe's Nightside the Long Sun goes by the name of Blood. (In their city men all have single names that refer to animals or animal byproducts, like the protagonist Silk and his student Horn, but Blood is still an alarming name even in context.)
The evil-sounding connotations of Blood as a name is what led a young, babyface pro-wrestler to switch from his real name, Richard Blood, to the stage name Ricky Steamboat (arguably the only example of a wrestler having a more Badass real name than stage name)
Ragna The Bloodedge. In actually, one of the sanest people around. But he has a fearsome One-Winged Angel form which fits the trope to a tee.
Blood Raven from Diablo II, the first boss you encounter. If you waltz into the Burial Grounds at LV 5, fresh form the Den of Evil, she will mop the floor with you.
Subverted with Chiron, the wise centaur who taught many of Greece's greatest heroes. His name means "hand," but it had more the meaning of a hand that guides and assists—literally a "helping hand."
An honourable mention must go the Hyena People from Digger, whose females have the following, friendly, lovable names; Grim-Eyes, Blood-Eyes, Blood-Tail, Shadebones... most female hyenas seem to have them. Even the benevolent ones have names like Boneclaw Mother, and the smaller less aggressive males names like Owl-Caller.
Helicopter-chucking Shootfighter Tekken titan Iron Kiba pretty much trumps all of the above, as a combination Complete Monster and Old Master. He's also larger and sturdier than most Hokuto no Ken/Fist of the North StarBigBads to boot.
Final Fantasy XIII's Fang: Wields a dual headed collapsible spear that can be separated and dual wielded. She's naturally the best attacker of the game Plus she had turned into Ragnarok centuries ago and made that huge hole in Cocoon's shell you always see.
Only known name of a revenge-driven serial killer in Fullmetal Alchemist who is out to get every single state alchemist and all those who get in his way via alchemical brain explosion. He's so effective at this that all high-ranking officers temporarily abandon their HQ in Central City where he was spotted and head out to the Eastern boondocks.
Subverted in John Ford's classic, The Searchers: Cicatrice, aka "Scar," does indeed commit a heinous act in killing a settler family and kidnapping the two daughters...but after that he spends his time either oblivious to (as in, living his life and leading his tribe) or running from the man who spends years hunting him down, Determinator Ethan Edwards.
Naruto has the 9 Bijuu, aka Tailed Beasts, with immense amounts of power that increase exponentially with each tail. Their names are, in order of tails: Ichibi (a sand tanooki), Niibi (a fire-cat), Sanbi (a genjutsu turtle), Yonbi (a lava-breathing gorilla), Gobi (a dolphin-horse), Rokubi (a slug), Nanabi (an armored rhinoceros beetle), Hachibi (an ox with an octopus behind), and Kyuubi.
The Spiral: The Bonds of Reasoning series features a character named Eyes Rutherford.
The Primevals in Gao Gai Gar are all named after body parts, and each wields a power vaguely related to the part in question (Arm can punch people with gravity waves, Eye has precognition, etc.) Might not sound so scary until you realize that they can turn regular people into Zonders with The Virus, turn famous landmarksand the moons of Jupiterinto weapons and fuse into the planet-sized Z-Master
The Right Arm from The Maze Runner series. It's a rebel organization devoted to fighting WICKED (which in itself is a Name to Run Away From Really Fast).
Argus Panoptes ("all-eyes," which points to his constantly watchful nature as well as Eyes Do Not Belong There).
The "Argus Monitor" is a medium-size lizard with a pattern that resembles eyes, which is why it was named for this mythical character. It's almost a subversion, though, since other monitor lizards are much bigger and more formidable than it is.
In the episode "The Headband" of Avatar The Last Airbender, Sokka briefly wears a fake Badass Beard and adopts the alias "Wang Fire" (yes, Wang Fire, on a Nickelodeon cartoon) while posing as Aang's father. *
Sokka has worn the beard on several occasions after this, including a mini-comic in which he infiltrates the Fire Nation military under the name Wang Fire. The comic ended with him pretending to be killed while taking out a Waterbender and Earthbender, and being remembered as a hero.
Although not particularly intimidating in the show, Wang Fire has become a Memetic Badass among fans, identified as the god of manliness and beards and as a separate entity from Sokka.
The Crimson Chin from The Fairly OddParents. Timmy also adopted the name "Cleft" (as in "cleft chin") while serving as the Chin's sidekick.
