The name of the city has nothing to do with Fidel Castro in Cuba. Actually, the name of the city comes from Don Castro who had been given the land that both Castro Valley and Hayward sit on today. Of course, this land originally `belonged` to somebody else (the Ohlone Indians). But, the Indians didn`t have the means to keep Europeans and others from taking over the lands that they had been living on. The Ohlones were devastated by indoctrination into the Mission system and by subsequent governments that followed after the Spanish period.