Infinite Zero said:
is this the first time a country has change their name in this century?
Burma was renamed Myanmar a while ago, back in 1988 when they changed from the Socialist Republic of the Union of Burma to the Socialist Republic of the Union of Myanmar. The only thing new is that they've adopted a new flag, and shortened their official name (from Socialist Republic of the Union of Myanmar) to the Republic of the Union of Myanmar.
However, in the past century (20th), there have been quite a few name changes besides Burma's.
Iran was formally known as Persia in the early 1900's by the Western world. It was only after the 1930's or something when the name 'Iran' became known to the Western world, even though the term was used locally for a while.
Bangladesh was called East Pakistan until 1971.
Ghana was called the Gold Coast until 1957.
Belize were the British Honduras until 1973.
Lesotho was known as Basutoland until 1966.
Taiwan was often identified as Formosa until 1945, when Japanese colonization was revoked after World War II. Taiwan, though not an official name, is often used to substitute the official name of its state, the Republic of China, to avoid confusion with the People's Republic of China on the Mainland China region.
Just a few examples.