Bangladesh- In 1971 East Pakistan gained independence and renamed themselves Bangladesh.
Thailand- Till 1939, Thailand was considered as Siam.
Democratic Republic of Congo- In 1997, Zaire was renamed officially as DR Congo
Burma- A southeast Asian nation, was renamed as Mayanmar in 1989
Sri Lanka- In 1972 the island nation of Ceylon was officially named as Sri Lanka.
Iran- Iran was known as Persia for more of its history but was officially renamed Iran in 1935.
Ireland- Historically known as Iresh free State until 1937.
Netherlands- Govt. decided to change the name of Holland to Netherlands in 2020