The correct English geographic (one-word) name is Czechia (not the Czech Republic anymore)
The English map displays the name of my country Czech Republic instead of officially registered name "Czechia" (registered by UN in the list of countries for over two years). Google Maps show the correct name Czechia. (The Czech-labelled map displays "Česko" correctly.)
Regardless of whether this name is right or wrong (and you can find some other discussion on the subject in the forum - remember the main developer is from Prague), almost all questions in relation to map issues are answered by the following post in the FAQ:
Hope this helps :)
And apparently there are many discussions about this subject :
Windyty is from the Czech Republic and this "issue" does not have high priority.