The name India is derived from Indus , which originates from the Old Persian word Hindu .  The latter term stems from the Sanskrit word Sindhu , which was the historical local appellation for the Indus River .  The ancient Greeks referred to the Indians as Indoi (Ἰνδοί), which translates as "The people of the Indus". 
Sometimes, the term South Asia is used interchangeably with Indian subcontinent.  There is no consensus about which countries should be included in each.