Except Persians, who actually coined the term Hindu, used it as a ethno-geographical term. It was not used in a religious context. Also, the word "Indus" is the romanised form of the Greek word "Indós" (Ἰνδός).
The discussion leads to the inevitable conclusion that what some might think of as "Indian" is, in fact, English, Persian, and Greek in origin. Ergo, a nationalist monologue based on this verbiage will only lead to a similar exercise in mythic hilarity that is white nationalism based on Mein Kampf.
Source: Hindu /
Indus River