Okay, but in the title you say outright and in the OP imply the "Adventurer" class is meant to represent "the Everyman" by which I assumed you meant the Everyman stock character archetype. Maybe you meant something else. I don't know. Of the concepts you've described here, only the first seems like it could be an everyman, so I would guess you're going for something much broader.
As for Adventurer, it seems inaccurate, or at least overly broad. I mean, all the PHB classes are adventurers, so wouldn't a better name for this class be Non-adventurer since it is explicitly not them? Or, if the idea is to distinguish the class from the professional adventuring classes by its lack of training, you could call it the "Amateur Adventurer" or just the "Amateur".