Proper noun
Morella
An ancient walled city in the province of Castellón, Valencia, Spain
Morella (plural Morellas)
A surname from Italian.
Modern productions typically include both of Don Ottavio's arias, both the original " Il mio tesoro main" and " Dalla sua pace main," which replaced it in the Viennese premiere in order to suit the tenor Francesco Morella. Source: Internet