Well, you mean two things actually. The actor that played Eragon in the movie is Edward Speelers. But you also mean what is Eragon true name. No one knows that.
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They talk about brom being a dragon rider and that brom is really eragons father (ps you find this out in brisingr)
Nope, Brom is
Eragons dragon is called Saphira.
Yeah he is, and you find that out in the 3rd book, Brisingr.
look at: What is Eragons description in the eragon book?
The dream is about Arya being trapped in the cell in Gil'ead.
there is a second dragon rider.... it is morgan... he was eragons older brother.