As I said, the term Hindu did not describe a religion until a few hundred years ago. All the people living in the Indus Valley and beyond were called Hindus.
I think that you are mistaken. The term Hindu, as a religious connotation, has been used by Al-Biruni, in his book, commonly known as "Kitab ul Hind", written in about 1030 AD, and translated in English, as "Alberuni's India". It is obviously more than a "few hundred years".
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