Descendents of Ben Tao were rewarded the Ruan kingdom (south east of Jing Chuan in Gansu Province). The Ruan kingdom was eliminated by Zhou Wen Wang during the Shang Dynasty and its people began to bear the last name of Ruan. Another origin of Ruan came from the Shi (stone, rock) family who changed their name to Ruan.
In Vietnamese, the surname Ruan is known as Nguyen, which is the most popular family name. Although not all Vietnamese who bear this family name can trace their roots back to their Chinese ancestors, Nguyen is clearly a Chinese name. Many Vietnamese with this surname claim their ancestor to be a man called Ruan Cho, who was a governor of ChiaoChih (North Vietnam) during the Chen Dynasty (~600 A.D.). (Ruan means a musical instrument)

Hometown: Chen Liu town in Kaifeng Province.
http://www.yutopian.com/names/06/6Ruan179.html

Oh oh, looks like you're right about the issue of Vietnamese surnames being the same as Chinese. Bah, I guess the site is just for fun. I didn't actually take the time to research the site, or learn anything about his. So, it doesn't necessarily mean that because you have the same surname as the people that originated in a particular area, that you are actually from there. Even LangTao mentions that his name originated in a different region rather than the site had categorized.

Many Vietnamese were forced (by their own Emperors) to adopt the surname.

The Nguyen Surname came into existence when the Ly Dynasty (1010-1225) was overthrown by the Tran clan, which established the Tran Dynasty in succession (1225-1400). Most of the Ly royals were either murdered by Tran Thu Do (the Tran clan's patriarch) or fled to Koguryo (Korea).

The commoners with the Ly surnames were forced to change their surname to Nguyen as to wipe clean the roots of the Ly.

What really? serious? I don't but i actually know a Vietnamese guy name with the surname "Ly".

Does anyone know the Tran's surname.....Like the Nguyen..they have a poem which they take for their surname...does anyone know the Tran's one????

is this another case of china bashing?

it's called history my friend....