This was my reaction at the Superman name unveiling.Lois obviously did name him in the intterogation room scene. The name was on her mind. Sorry there wasn't a scene to spell that out en total for some. Ithink we as fans take stuff on screen WAY too literally, far too much.
Lois mentioning the S, thinking of a name
Being interrupted
Hearing the name Superman for the first time from some two bit soldier in the mot casual of circumstances
To this day