So far I haven't seen anything to directly confirm or deny this, but during the Character Creation when you choose your secondary base class for your Avatar (Talents I think it was called) the option of becoming Herb Merchant is listed as Apothecary. However this isn't direct evidence since the option that gives you Spear Fighter is listed as Lancer, and Wyvern Rider as Dragon. They do have some of the classes listed correctly though: examples are Sky Knight, Samurai, and Outlaw, which indicate that at least some of these are more than mere descriptions of the classes but are indeed the class names themselves.
See Page 2 of this thread for the full list.