In my story there is this band of dragon slayer-ish people who are kinda evil…
I have no idea what to call them…so i hope someone has ideas! Please, and thanks in advance!
If dragon slaying is bad you could just call them The Dragon Slayers. I know it isn’t super creative, but it does tell the reader who they are and what they’re about.
[name]Do[/name] they do anything else besides slay dragons?
well they basically just slay dragons. Most of them are born into a dragon slaying family, and there’s some just are regular humans who decide to devote their lives to the leader. They have enhanced senses and everything, and are very violent. if this helps you at all i don’t know, but maybe gives someone ideas!
CleanSlate (kind of a code name, trying to wipe away dragons which they probably think are evil, and slay is close to slate)
the Purifiers (sticking with the thought that they think dragons are un-pure or evil)
Underground (going around society to kill dragons, secretly)
Operation ____ (any number or word that describes what they are doing.
I really didn’t have anything for this one! Tough question. 
Like that old Disney show with the people who can become dragons and the dragon hunters??
Anyways, I’m guessing you’re looking for a BAMP sounding name… I’d like to point out that a famous dragon hunters was named [name]Apollo[/name] Beowolf.
You can play with that one for a bit…
Otherwise, you might want power-orientated names and being number one.
Or be inspired by their hunting equipment.
Use the leader’s name?