Henri Christophe
L'empereur
There are others game who have this kind of mechanic.She also kickstarted the first colonies of german immigrants in southern brazil, if civ VII comes with an immigration mechanic she would be a cool pick, with an ability to attract more immigrants in some way.
On Black & White 2 I remember to have 4 ethinicitys, the greeks, the norse, the japanese and the aztecs
And you can clearly look at each person on your empire and distingui of what ethinicity it was.
I just don't know how this mechanic can works in a game as civilization, where the "population" is a number who range from 1 to 20 I guess.
Just if we have some statics in the city.