I really don't like the idea of dropping the term "Amazon."  The virtues of the term are that people know what it means -- warrior women -- and that is a CONSIDERABLE virtue, when it comes to introducing folks to what is a regrettably alien set of cultures.  The downside is all the competing and incompatible renditions of the amazon concept out there.  Maybe the compromise is to have "[Socio-Political/Geographical Adjective] Amazon" as the name of a prestige class?  Like, "Nibomayan Amazon"?  Then, like "Zombi Cultist," you're providing more detail and context than the common-use term alone.  (I.e., having "Cultist" as a prestige class would be a bit uninformative..