That trend began in the 1960s when Cassius Clay change his name to Mohammed Ali to avoid being drafted citing religious grounds. However, he was arrested and convicted of draft evasion. The Supreme Court overthrew the decision. After that many other black athletes began changing their names, too. Lou Alcindor became Kareem Abdul Jabar, etc.
Louis Farrakhan started his rabble rousing and then Islam became a protest movement. That is what we are seeing the continuation of today.
Ah, I had forgotten about the trend-setting Mohammed Ali.
However, all the Jamals and Kareems of today are not Moslem - although they probably sympathize, under the misconception that Islam is anti-white - any more than all the Antoines and Marquises are French.