The official Sanskrit name for India is Bharat. India has been called Bharat even in the very early ages, at the very dawn of civilization.
The name `India’ is derived from the River Indus, the valleys around which were the home of the early settlers. It was the home of the earliest urban civilization of India, namely the Harappan Civilization. The most famous sites of the Harappan Civilization are Mohenjodaro and Harappa. The Aryan settlers also started the spread of their civilization from the Indus valley. The Aryan worshippers referred to the river Indus as the Sindhu.
The Persian invaders converted it into Hindu. The name `Hindustan’ combines Sindhu and Hindu and thus refers to the land of the Hindus.