Bullitt, Dredd, Majestyk, Matrix, Plissken, Rambo, Rockatansky, Ryback, Spartan, Storm... all of those names come from action movies. They sound inauthentic and over the top. Some literary characters have names like "Brown" or "Holden" or "Moriarty", names that wouldn't strike anyone as being particularly tough-sounding, yet the characters who bear them are undeniably tough, and sometimes vicious and diabolical. Are they tough and vicious and diabolical because of their names? Of course not. A name is just a name. Calling your character "Savage" or "Slaughter" just to give your reader the impression that the character is supposed to be tough is condescending and dumb. You could name a character Smith or Jones, Greenleaf or Smiles and it wouldn't matter so long as you know how to write a decent character who displays the traits you intend. If you can't come up with your own names, then you aren't capable of writing anything anyway.