It's not an acronym, and stay away from speculative discussions around what is could stand for. The name of the upstream, community edition of OpenShift has changed from OpenShift Origin, to OKD.
Is it Old Kitchen Drawer?
Now I am scared a bit https://www.urbandictionary.com/define.php?term=okd
But to be honest ... what was wrong with the name Openshift Origin?
A collaborative learning environment, enabling open source skill development.