Indus River
The word Indus and the cognate word "Hindu" are derived from Sapta Sindhu (Sanskrit for "seven rivers") for the region is ancient. The Ancient Greeks used the word Indós; Hinduš was Old Persian; Sindhu in Sanskrit. Latest languages on the sub-continent use either Sindh (modern Sindhi) or Sindhu (ancient Sanskrit) or very similar words. The river's region's name came to be the name of the country India.