Sofia L. answered 12/12/23
Masters in Czech, my native tongue, with 20 yrs of tutoring experience
The word "Čechie" from "Čechie Karlín" refers to a specific location or district within Prague, Czech Republic. It doesn't directly relate to the English term "Czechia," which refers to the country as a whole.
"Čechie" in the context of "Čechie Karlín" likely has its roots in the historical and geographical term "Čechie" (or "Čechy" in Czech), which denotes the Bohemian region of the Czech Republic. Karlín, being a district within Prague, might have adopted the name as a local reference.
On the other hand, "Czechia" (or "Česko" in Czech) is the official short name for the Czech Republic as recognized by international bodies, introduced officially in English usage in 2016. The term was intended to provide a concise and straightforward alternative to the longer and less familiar "Czech Republic."
So, while both "Čechie" and "Czechia" have their origins in Czech geography and identity, they refer to different entities: "Čechie" being a local district within Prague, and "Czechia" being the internationally recognized short name for the country.