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According to the Chinese Wikipedia version of this article, the surname is Ngo Dinh, and the given name is Diem. This is due to the fact that the daughter of Diem's brother is called Ngo Dinh Le Thuy. If only Ngo is the surname, then the daughter in question would have been named Ngo Le Thuy.

Make sure you read this!!!  01:02, 23 March 2006