We see the word zombie everywhere: movie titles, song titles, books, t-shirts, stickers...you name it. It's as common a word as tinfoil or chocolate.
If I tried to copyright or trademark the word 'chocolate', lawyers would laugh at me. I can claim ownership of something like Chickie's Chocolate or Chocolaticious (if they aren't taken), but not just the word chocolate on its own (or banning any derivative use of the word in the future).
Got it? Good. Now that you understand the very basics of the law (and have a hankering for chocolate), we can move on.
Rob Zombie has threatened to sue someone for using the word 'zombie', claiming ownership of it.
Not the phrase Rob Zombie but the word zombie.
Eric Weiss posts zombie humour on twitter as ZombieRiot. That's how I know of him.
He is also part of ZOMBIE!, a solo multimedia project with a focus on horror rock, artwork, and clothing.