Seeing as how Wanda could cast a findamancy spell, along with many, many others, It doesn't seem like the "class name" (ie: Crocamancer, Thinkamancer, Dirtamancer, etc) really means anything mechanically, but is just what that caster tends to do the most. Casters with multiple talents are probably pretty rare, Wanda being a rather rare case of rare, with lots of talent in many schools.