Prolly the closest in recent times would be Tupac, but no one holds the same place as Beyonce bc no one dominates their industry like Beyonce does. But young men also look up to all the hip-hop moguls, like Russel (hopefully not anymore), Jay-Z, Puff...
the point is, yes, Beyonce is a rallying point for a lot of people... but that really is because a) no one dominates their industry the way Beyonce does (although no one compares to Martin/Malcolm in activism or Obama in politics), and b) black boys have more options.