Greek names from "The Oedipus Cycle"

I just read the book "The Oedipus Cycle" ... and I am wondering,
If the name Oedipus means "wounded foot", who knows what the names Ismene, Iocaste, & Antigone mean?
I thought they were lovely names and would like to know what I might consider naming my future kids.
Haha, no I'm kidding, lol, but Ismene, I wouldn't mind using.. What, it's pretty! And If you change the last E to an A and make it Ismena, the word would mean "Change" in Russian. I think that sounds powerful. I like it. =]

But anyways.. who knows what they mean in Greek?

Thanks!