Superman/Supergirl continuity

[Revan]

I have a question about supergirl.
Ok, in Superman: The Movie with Chris Reeve, Kal-El wears the S on his chest because that is the symbol Jor-El wore upon his before the destruction of Krypton. How could the S stand for Superman if the S was Jor-El's symbol. Lois Lane gives Kal-El the nickname "Superman" after their date if I remember correctly so before she called him Superman, he was not known as Superman. What a nice coincidence that she named him Superman AND his father's symbol was an S.

So the question is, why does supergirl wear an S on her chest like superman? Could it be her family's symbol as well or is she just copying Superman's suit. Is this just a movie goof? Perhaps Michi heavenly could shed some light for me?

[MadPirateBunny]

this might help...
http://en.wikipedia.org/wiki/Superman_logo

[Spawn Guy]

Or maybe she just wouldn't be able to call herself Supergirl if she didn't.

[Mr._Mutant_Man]

The Supergirl movie is pretty cheesy but it is certainly watchable. It helps that Helen Slater is cute, and I've always kind of liked the Supergirl character. I marked out when Kara came back, because I like the junior versions of superheroes. I like Wonder Girl more than I like Wonder Woman.