Where did the term Indian originate from?

The term "Indian" originally comes from the name "India," which was derived from the River Indus. Ancient Greeks referred to the region around the Indus River as "India," and this term was later adopted by Europeans. The name eventually became associated with the diverse peoples and cultures of the subcontinent of South Asia. Today, "Indian" typically refers to the citizens of India or the cultural and ethnic groups within the country.