How about Kradelber?

No.

Though I was thinking Kua.

as a german i have to say kaliber doesnt sound that good... maybe i see it like e.g. the cal. 50 barrett or shit like that..
kradle, kradel or cradel would sound nice.
also i've never seen someone spelling steve aoki as oaki :P

Kampfer

Kray, Cray, Kre, or Kou

I see you picked Kradel... Good choice it sounds good and is recognizable.

Cylinder

BOX