I hate to be "that guy" but with the recent rise of Kubernetes pretty much everything related to cubes written with a K is associated with technologies related to it. A very recent example is https://kubic.opensuse.org/
I'm fully aware that Kube predates most of those projects but nevertheless my point remains.
Given that Kube did not yet have its 1.0 release, I think there's little harm if another name was chosen.