Question: when did the name persia change to iran

title: Name of Iran
text: In the Western world , Persia ( or one of its cognates ) was historically the common name for Iran . In 1935 , Reza Shah Pahlavi asked foreign delegates to use the term Iran , the historical name of the country , used by its native people , in formal correspondence . Iran literally means Land of Aryans in Persian language . Since then , in the Western World , the use of the word `` Iran '' has become more common . This also changed the usage of the terms for Iranian nationality , and the common adjective for citizens of Iran changed from Persian to Iranian . In 1959 , the government of Mohammad Reza Shah Pahlavi , Reza Shah Pahlavi 's son , announced that both `` Persia '' and `` Iran '' could officially be used interchangeably . 

Answer: answer: Since 1935, when foreign delegates where asked to use the term Iran in formal correspondence, the use of the word "Iran" has become more common in the Western World.
answer: In the Western world , Persia ( or one of its cognates ) was historically the common name for Iran . In 1935 , Reza Shah Pahlavi asked foreign delegates to use the term Iran , the historical name of the country , used by its native people , in formal correspondence . In 1959 , the government of Mohammad Reza Shah Pahlavi , Reza Shah Pahlavi 's son , announced that both `` Persia '' and `` Iran '' could officially be used interchangeably .