In 1989, the military government officially changed the English translations of many names dating back to Burma's colonial period or earlier, including that of the country itself: "Burma" became "Myanmar". The renaming remains a contested issue. Many political and ethnic opposition groups and countries continue to use "Burma" because they do not recognise the legitimacy of the ruling military government or its authority to rename the country.
The country's official full name is the "Republic of the Union of Myanmar" (ပြည်ထောင်စုသမ္မတ မြန်မာနိုင်ငံတော်,Pyidaunzu Thanmăda Myăma Nainngandaw, pronounced: [pjìdàʊɴzṵ θàɴməda̰ mjəmà nàɪɴŋàɴdɔ̀]). Countries that do not officially recognise that name use the long form "Union of Burma" instead.
In English, the country is popularly known as either "Burma" or "Myanmar" i/ˈmjɑːnˌmɑːr/. Both these names are derived from the name of the majority Burmese Bamar ethnic group. Myanmar is considered to be the literary form of the name of the group, while Burma is derived from "Bamar", the colloquial form of the group's name. Depending on the register used, the pronunciation would be Bama (pronounced: [bəmà]) or Myamah (pronounced: [mjəmà]). The name Burma has been in use in English since the 18th century.