The bird makes a call that sounds like the word “dee”, over and over. Just as someone who runs is a runner, a bird that’s dees, is a dee-r, so it’s not deer in the sense of the animal the way you may think. At least that’s what I’ve been told. The “kill” part is a bit strange, but I’m assuming it comes from the fact that this bird will feign a broken wing to distract a predator away from their nest. All in all, I’m really not sure on the origin of the name, but that’s what I’ve learned in my last 3 years of actively being a part of the birding community.
Extinguishers wouldn’t do much, but you may mean fire sprinklers, but that’s probably never going to be installed. You’d have to inspect, test and maintain that system, and who wants to invest time and money in that.