Creepy Names

So, I wouldn't call the thing I'm writing right now horror, because I will be amazed if anyone above the age of ten decides they need to sleep with the lights on after reading it. I would, however, call it kind of creepy. And the creepy things in it need creepy names, which they don't have right now. Instead they have names like Library Snake and Raven Guy. So I want some help coming up with creepy names. Preferably these should sound like urban legends rather than fantasy monsters, although some fantasy monsters names are well-known enough in popular culture that they could actually work (calling one of these guys a goblin could work, for example, but something completely made up like Urugal probably won't work, even if it's a pretty good name in general).

Creepies what need naming are as follows:

Library Snake is a giant snake who lives in a crumbling library. He's only about as thick as a boa or other large-ish but still mortal snake, but he's several hundred feet long. He's constantly curled up on just about everything in his library, and is extremely sneaky, often watching trespassers without their knowing it. He has a homicidal disdain for visitors.

Raven Guy is a scary looking old man in a big black coat and top hat, both made of black feathers. He can turn into a flock of ravens (or maybe crows or some other black bird) at will. He works for the villain. He also has a partner the details of whom I haven't really worked out at all, so if you wanted to give him a name that works as one of a pair, that'd be cool.

The Sniper I think I might be okay with as-is, but I think I could definitely do better for him (he is a fairly major villain). He's got burned/scarred skin and no lips, so he is perpetually grinning, but is otherwise pretty much a normal human being. He has a bow and likes to teleport around and murder people for giggles.

The mutts are headless grey hound dogs with mangy fur and rings of teeth in the stump at the end of their neck.

The coats desperately need a better name. They wear gas masks and long black trench coats which they always keep buttoned up. They walk around with guns and shoot everything they see. They never speak, no one really knows where they came from or what they're up to, and people are pretty sure they just arose spontaneously because Otherworld is weird and arbitrary and does stuff like that sometimes.

For reference, some other names that I think worked out alright for some of the other monsters have been Queen Mab and Mister Jack Devil, although both of those are "good guy" monsters rather than villains, and thus don't need maximally creepy names.

Thanks in advance for helping.

@DarthPanda: As One Monkey mentions, Bookwyrm is too cute for a creepy and homicidally territorial monster (although it could work out alright for the Tim Burton-esque "creepy but in a non-threatening way" ally monsters). I like Rook a lot, though, and the yeth hounds are great, especially since they can be easily shortened to just "hounds" in casual conversation.

Also, while I also really like the setting I'm building, I confess that I'm really worried I won't be able to do it justice with the plot and characters. Fingers crossed, though.

@Shadow_Ferret: I must decline your suggestions on the grounds of practicality. If I were to use them, the resulting manuscript would be so horrifying that no mortal agent or editor could possibly read to the end of it without dying of fright, thus making the book effectively unpublishable.

@One Monkey: That's the general feel I'm going for, but "coats" just isn't giving me that feeling.

I mentioned this above, but the simple, colloquial names are what I'm going for, especially for the things like the coats which don't have proper names to begin with since they're a group rather than an individual. Coats just doesn't feel quite right.

Also, I'm still lost on Library Snake. I'm thinking of just giving him some kind of actual name. It's not ideal, but some of the other monsters already have one, so meh.

Yeah, typically I don't treat forums as good sources of demographic data, but the consensus is actually universal, so I guess I'll probably roll with coats.

The book is most definitely not middle grade, though. I'd originally intended it as YA and I would still kind of like to keep it there, but pragmatism suggests I should bump it up to adult. It's got a clear male focus and YA is not a demographic that likes males very much right now. On the one hand, you might say that I'd be doing some good by diversifying, but that's only if my book is actually good enough to pull in readers who don't normally have any reason to go into the YA section at all, and that's really not something an unpublished writer can count on at all.

And in light of that, "Sneak" doesn't work. Because this guy isn't mischievous, he's a murderer. Skins sounds good, but doesn't seem to fit the mood of this particular character very well.

Ooh. I don't know why, but long coats just sounds perfect for these guys.

Okay, double-post to bump because I have basically the exact same problem with the exact same setting.

I had a concept in one of the good guy monsters' background that he was actually one of seven siblings. His name was Jack Sunday Devil and the other siblings were all named <Name> <Day> Devil. I wasn't really concerned with their names, since it's something that might be occasionally mentioned at best, but now I've decided to introduce one of them into the plot as a villain.

The quick way to sum this guy up is that he is basically the Joker from the Dark Knight or the Killing Joke. He's a bit more classy and refined, but the fundamental conceit of "everyone in the world is one bad day away from being a baby-eating monster just like me" is his fundamental motivation. He's kind of classy, though, his minions are clockwork automatons called dolls (borrowed from someone else), and he gets wings, which so far none of the other Devils have. The name Sunday is taken as the only one who stayed benevolent and Saturday is taken as the most powerful, whereas this dude is the third strongest mole in the cave. I'm thinking probably Monday for his middle name, but I'm drawing a blank for the first.

EDIT: Oh, and while I'm at it, does anyone have a better name for dopplegangers than just the original's name spelled backwards? There's a certain elegance in that the doppleganger is literally your reflection, so if you walk in front of a mirror and find you don't have one that means your doppleganger has wormed its way into the real world and is trying to murder you and take over your life. But it still seems kind of hokey. Although it's cool that "Liam" is "Mail" backwards and that is actually an okay name, "Angela" is just "Alegna," which sounds kind of dumb.

Also, I'm kind of waffling on the demon samurai/geisha and her army of ghost ashigaru, currently named Jade and the Oda. On the one hand, that's really derivative. On the other, her minions and her are supposed to be a minor villain with a recognizably human motivation ("I want your land") which is comparatively non-terrifying. People liked the coats so much even though I didn't, so I figured I'd run it by the forums and see if anyone thought it was off for the setting.

EDIT 2: Also, also, I thought I'd mention that I eventually just named the snake "Aniphas," because whatever, he can talk, it makes sense he'd have an actual name name even if it isn't maximally creepy.

EDIT 3: Also, also, also, I think I should mention additionally that I've got a bunch of monsters needed in various places in the plot and am coming up with them as I go, so I might end up needing more name help a bunch. And if anyone has any awesome and preferably bizarre monster ideas, please give them to me.

The Oda clan is a historical thing from the one part of Japanese history outside of WWII I can rely on a fair number teenage males to actually know about, since people love making video games about it.

I think I like the ring of James Monday, though.