How the name of a river represents the people around it

Have you ever been to northern parts of India or Nepal?

The picture above is showing major rivers that came from the Himalayan glaciers.
Even though I'm now one of the TCP presenters, I am not going to talk about the climate change and how these glaciers are diminishing from the face of the ol' earth.
What I've been wondering, ever since I saw a map like this in Al Gore's presentation, was...:

The Yellow River runs thru China.. and so the Chinese people are mostly Yellow! Maybe not in real colour, but that's what the whites always told us. And these Chinese people definitely represents the yellow circle in the Olympics logo.

Anyways, moving on... And then you'll find the Mekong River runs thru Thailand, Laos and these type of countries, and I guess this explains why there are so many Sekongs in the whole Thai Land !!

Now I wonder if the people in north India can be categorised as Gengges ?!! They do smell.. Well the majority of them do.. and that's definitely one criteria of Gengges...

Oh and by the way, do you know that the meaning of 'Liwung' is bingung or kusut? Just like the people of Jakarta from their behaviour to their mentality ! ;)