As far as I can see the name of the Czech Republic is still Czech Republic. For example, "must still win cabinet approval before the foreign ministry can lodge the name with the United Nations and it becomes the country’s official short name" source: http://www.theguardian.com/world/2016/apr/15/czech-republic-czechia-new-name
All we know is that the name change has parliament approval, but that is not the end of the process.
Hey, just seen this, sorry for slow reply.
I don't agree with you reasoning, and I think it was misleading then (it was a foregone conclusion that the Cabinet would approve it; the President had said three years ago that the change should happen).
More relevantly, it is flatly wrong now (unless you're seriously claiming that until the next meeting on UNGEGN in September it isn't 'true', and that the elected government of the people of Czechia do not have the right to determine their own name).
Can you please self-revert?