F type was the prototype code for the car. Esporanda was its registered model name.
to quote from Autocar 5th April 1980 ''Jensen Motors were anxious that a replacement, to be code named the F-type, soon be put in hand. After completion of a prototype program, production was approved, the Esporanda was registered with the SMMT ( society of motor manufacturers and traders) and a launch date was fixed for the 1973 Earls court show.
To quote page 177 of the book 'Jensen' talking about the F type '
Jensen had tentatively registered the name Esporanda for the new model.... '
the author - a well known Jensen expert Keith Anderson!
The other car is Esporando, note the 'o' at the end, replacing the 'a' of the official car.
The Esporando was named as a kind of tribute to the F type Esporanda.