Who renamed Persia as Iran?

Answer 1

Iran is the ancient name of the country; the Aryan tribes who formed the country in the Achaemenid era united the plateau in that region and called the country Iran (Aryanam in ancient texts), meaning "the land of Aryans".

The name Persia was introduced much later (around 600 BC) and it derives from the ancient Greek name (Persis) for Iran's maritime province called Fars/Pars. Based on this, other European nations termed the area Persia.

On March 21, 1935 Iran formally asked the international community to call the country by its native name.

In 1959, Shah Mohammad Reza Pahlavi, before his removal from power announced that both Persia and Iran can be used interchangeably.