The name generator will give you either 15 generic style player classes or 15 NPC types. The distinctions between players and NPC types are mostly specified in the name. This choice can be used for both uses. The player classes are stuff like 'Battlemage,' 'Warrior,' 'Arachnomancer,' etc. An NPC form would typically involve anything like 'Chaos Fighter,' 'Arcane Battlemage,' or 'Demonic Mercenary' to differentiate it. These extra details are typically given to games players through talent trees, but we have chosen to stick to the standardized types, so you don't have to click a hundred times just to go through all the lessons that are basically the same.
To generate another 15 random names you just have to press the button. With every click 15 new names are generated.