Nice idea for a quiz! But shouldn't Czechia and Czech Republic (Cech Republic = Czech Republic by the way) be reversed and shouldn't you also maybe use capital letters?
All the names in this quiz are actually accepted by Jetpunk so the caveat can be changed. Both the alternative and the originals (apart from Great BritIAn which should be Great BritAIn) all work as type-ins in Countries of the World etc.