Martin Bernal (of Black Athena fame), incidentally, uses the term "Aryan" to besmirch mainstream views he disagrees with, trying to insinuate that those who hold those views are racists, but that is just Communist agitprop on his part.
I am not an expert on the history of India, but if there were people in India 3000 years ago who called themselves by a term resembling the word Aryan, the Nazi misuse of the same word 3000 years later would not change it.
Madame Blavatsky was the one who first drew a connection between the "Vedic/Aryan" culture in India and its connection in Europe, which is where Hitler picked up from.
Look up Madame Blavatsky on google.
I've heard it is also related to the word Eire for Ireland, and the word Ehren in German.