From a Russian dream interpretation site:
If you dream of a Jew - there is an an insidious person who tries to humiliate you in your environment. Dialogue with a Jew in a dream promises you a successful way out of the predicament, in which you are caught because of your cheating colleagues. Punishment awaits the guilty, and you shall get a reward for work well done.Hear, hear!
The only other case I was able to find, where a specific nation figures, was about an Egyptian:
If you were an Egyptian in your dream, it means that in your heart you are an actor and crave recognition, although you don't deserve any special merits. Stop putting on a mask when talking with people, be real. People see hypocrisy subconsciously and do not trust you. Show your true colors and your relationships with others shall improve.Oh well, whatever.