Czechia is also known as Bohemia
We have three main regions. Bohemia, Moravia, Silesia.
Bohemia - Keltic in latin
Moravia - full of Austrians and Germans
Silesia - Mixed by Czechs and Poles
By DNA, there is only 30% of Slavs in Czechia. Rest are Germans, Kelts and Vikings (ofc there are Romanians aswell but they are minority)
The only thing we have Slavic is the language, which is also not fully Slavic anymore since noone is using the official version of it and "Slangs" are strongly Germanized (For example the whole Moravia is using tons of German words) or are changing Slavic words by English words.
Learn something about it before you gonna talk shits, thanks.