In Sophocles' Electra, it is revealed at the end that one of the guards there is Electra's long lost brother. What is the name of this guard? I have looked for it online, and in the book he is referred to by his title.
While the passage in question is unreadable through Google Books, I fear you've just misunderstood the translation. This is the part, right?
That's not her brother. She has but one brother, Orestes, and the "guardian" is actually the pedagogue (paidagōgos).