Taikonaut is the word sometimes used for Chinese astronauts in English language journals and Taiwan and Hong Kong. It's mix of Mandarin and Greek (naut = sailor in Greek). Chinese call their astronauts hang tian yuan.Indian astronauts will be vyomanauts.
Astronaut is still valid name for crew member of a spacecraft in any nation.
After a quick google, I believe you are correct. The term doesn't seem to be very well known outside of space circles, though. Maybe that's why the BBC opted for the familiar.
Astronaut is still valid name for crew member of a spacecraft in any nation.