User blog comment:Detective SkullWolf/Skull's Super Cool SFW Summer Votes (2017)/@comment-9749276-20170711125128

Oyeah, I just remembered something. Someone else asked that question about the weapon's name a while back, and Mantis said something about the weapon's name simply referring to Krieg's backstabbing nature and the like.

Also, regarding the whole sense of calmness, Krieg's kinda got that down by himself considering his more composed and efficient fighting style (in comparison to Blitz's stylish flair and especially Zagan's brutal offense).