The Soviet Union replaced German city names in the former East Prussia that became the Kaliningrad Oblast and Japanese place names in southern Sakhalin Island with Russian names unrelated to the old German and Japanese place names after annexing them in the aftermath of World War II.
The military junta changed the official English name of Burma to Myanmar in 1988, even though both were pre-existing names which originated from the Burmese language and used interchangeably depending on contexts (see Names of Burma).