A large percentage of the US only uses a tiny portion of available first names anyway. How many Johns are there, for crying out loud?
I think they are referring to "wen ming". In noun form it means "civilization". But is extremely unlikely. In this case, "wen" is probably the generation character, simply meaning "civil", "gentle" or "scholarly", while ming is "bright", "clear" or "enlightened", usually meaning smart and with spirit.
In a common Chinese naming system, the two characters are each one character of a "word", as most nouns are 2 or 3 characters long. In the traditional naming convention, all the male or female siblings of a nuclear family share one common character, denoting the generation, and then the second character the individual name. Both characters together is the complete "first name" in English. Often the mainlanders only go with one character though (hmm... how many siblings would they have anyway?).
As for the "290,798" number, you'd be surprised how accurate that number is, at least according to when the number was taken. The Chinese keep a meticulous record of all births and deaths, as well as the whereabouts of everyone, surpassing even the West, due to the government structure and a long history of the census that can handily put the Romans to shame. The death and injury tolls of the Szechuan earthquakes are accurate to a (hu)man once things are settle, give or take several dozen at most.