No NJ. The Country's formerly known as Checkoslovakia are Slovakia and The Czech Republic. But I can see why you were confused. I had never heard of Brakaslavian people either, and the reason for that is that no such thing exists. There is no Brakaslavia and never was.
The closest thing to it is Brataslava, which is in fact the capital city of Slovakia.
So somewhere your thinking was kinda in the right place