This reagon was always being called as saptha sindhu,bharatvarsha,arya varta.Egyptian also called this land as "the land of seven rivers" and greek called it as "Indus" this is how we got the name India.All religions born in india were called as hindu,that is why hindus can be boudha,jains and simply hindus too.Afterall what's there in name.But one thing is different from other religion hinduism is an inclusive religion.Anyway Arabstan or Aravsthan is a name given by hindus to the Arabia,do you know that.
