Answer:
   
   The Jewish religion is practiced by people of diverse racial and
   ethnic backgrounds, as a result of the continual process of conversion
   to Judaism. Thus, Jews today are a mixture of descendants of converts
   as well as direct descendants of ancient Israelite Jews. You cannot
   determine who is a Jew based solely on name, racial characteristics,
   or any other physical characteristics (including circumcision, for
   much of the male general population undergos this procedure).
   
   Among North American Jews, individuals of Eastern European Ashkenazi
   heritage are predominant, although before the late 1800's, individuals
   of Sephardi origin (i.e. Jews who settled around the Mediterranean
   basin at the time of the diaspora) were more common.
   
   Other groups of Jews include the Arab and Yemeni Jews. In fact, there
   was a Jewish kingdom in Yemen in the early Middle Ages under the rule
   of Dhu Nuwas. There are also Jews of Persian origin. The larger groups
   of non-Caucasian Jews include the Jews from Ethiopia.
   
   Other Jewish communities include the Kaifeng Jews of China (now mostly
   assimilated). Until 1960, there was a community of cave-dwelling Jews
   in southern Libya. A community in Burma claimed to be Jews, and rumors
   and legends abound about African, Native American, and other tribes
   claiming Jewish ancestry. There are also Jewish communities in India.
   
   A 20th-century convert community, the Abayudaya Jews, exists in
   Uganda, Africa.
   
   Jews may be white or black. No one knows the skin color of the
   patriarchs, Abraham, Isaac and Jacob. We do know that there was some
   mixing between the Jewish and the Hamatic nations. Some biblical
   scholars believe that Abraham was half-Chaldean; there is some
   evidence that the Chaldeans were black. The point of this: to
   reiterate what was said at the beginning of this answer: You cannot
   determine who is a Jew based solely on name, racial characteristics,
   or any other physical characteristics (including circumcision, for
   much of the male general population undergos this procedure).