He went to elementary school in Indonesia as Barry Soetoro, but was sent back to Hawaii to live with his grandparents prior to adolescence. I don’t think his high school records have been released, and no one knows when he changed his name back to Obama or what passports he has used.
He has apparently had Kenyan, British, Indonesian, and — one would assume — U.S. citizenships.
He was on the state championship basketball team at Ponehou HS (however you spell it). I'm sure his name is in the Hawaii newspapers somewhere. I think he was listed as "Barry Obama" at that time.