Vietnamese is either, a Language, or a Person.
The people, are obviously from Vietnam, being from the Tribal times. Another name for Vietnam is Yuènán 越南
Vietnam was conquered by the Chinese alot. Though they still managed to fight back, even if they lost a rebellion. They were invaded by the French btw. They did manage to win the first Indochinese War, but that still divided Vietnam by South 'n North. They fought, naming the controversial war the Americans have lost in, the Vietnamese War.
And for the Language, it is
interesting. Vietnamese didn't use the Roman Alphabet Quốc Ngữ as it's
Alphabetical System from before. It was changed by the French, made by the
Portuguese. And I gotta say. Good job, Alexandre de Rhodes. Vietnamese is pretty complex. Just like Chinese, it includes some tones. Majority of the words derive from Chinese. Due to the Chinese
dominating them for over the centuries, they used the characters from Chinese. Chữ Nôm
Don't get confused with Xin Chào. Beginners usually confuse it as a casual saying of "Hello". But it's not. It's used to ask for one's age as you say hello to them, it can be used to ask to say hello, or to say hello to a group. Some words like Có, Anh, or Chị are usually used. Beginners even confused "Bạn" with "You". Though, Bạn means "Friend". Though, to separate Languages and Ethnicities, they use "Tiếng" and "Người". This would be easier to know. As an example, "Tiếng Việt," the Language, and "Người Việt Nam,"
Vietnamese people.