The Czech Republic is official name of the country. Czechia is made-up word, with no history of long-term usage, pushed by the Czech government without any consensus or public discussion on the topic. Thus most of Czechs prefer the right and official name "the Czech Republic" instead of artificial "Czechia" term. In my opinion, the term "Czechia" is disgusting and there should have been at least discussion on high/expert level among scholars before sending letters to UN to introduce country's short name.
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RE: Go Czechia