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In page South China Sea:

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In Southeast Asia it was once called the Champa Sea or Sea of Cham, after the maritime kingdom of Champa (nowadays Central Vietnam), which flourished there before the 16th century.[7] The majority of the sea came under Japanese naval control during World War II following the military acquisition of many surrounding South East Asian territories in 1941.[citation needed] Japan calls the sea Minami Shina Kai "South China Sea". This was written 南支那海 until 2004, when the Japanese Foreign Ministry and other departments switched the spelling to 南シナ海, which has become the standard usage in Japan.[citation needed]