This is actually NOT my family line, but while I was researching my own, I kept a lot of info on miscellaneous Hunter's. I'm glad I was able to help!
I'm not sure about any of the rest of the family, but I've found in my research that Alexander, his brother John and their sister [whose name escapes me at the moment] were the only ones to come to America.
One of Alexander and Elizabeth (Steele) Hunter's sons was SAMUEL.He married Sarah (Sally) Whitworth, but I don't know if they moved from the PA area to South Carolina and then on to Georgia.
I'll check my miscellaneous stuff and get back to you!