Answer:
That is the Spanish name, and there is no separate English equivalent.
The country name "El Salvador" is Spanish for "the Savior". The official name of the nation is "República de El Salvador".
Originally, the Spanish colony was named "Provincia De Nuestro Señor Jesus Cristo, El Salvador Del Mundo", which translates to "The Province of our Lord Jesus Christ, Savior of the World", and was soon shortened in common use