What is the meaning of Hindu?

Answer 1

A Hindu is a follower of Hinduism. However the word Hinduism is what is worshipped by Hindus so it is a circular definition. Hindu is just a mispronunciation of Sindhu (as in the "Sindhu River")

There is nothing circular about this. Sindhu is the Aryan name of River Indus. Central Asians and Iranian Aryans could not pronounce the consonant 's', and changed it into 'h' (Hendu for Sindhu and 'Hapta-Hendu' for 'Sapta-Sindhu'; the land of seven rivers, the states of Punjab in Pakistan and India, and Haryana in India). And they addressed the people who lived in regions near River Indus or East of it as 'Hindus'. And the Europeans termed religion of hindus as 'hinduism'.