Multiple choice Who were the first to call the river Sindhu, ' Hindu' ? Persians Greeks Turks Egyptians Reveal answer Fill a bubble to check yourself A Correct answer Explanation The ancient Persians were the first to refer to the river Sindhu as 'Hindu' because their language did not have the 's' sound, so they replaced it with 'h'. This term later evolved into 'Hindu' and 'India'.