Seems a lot of people call the Manastash Ridge Trails area "Naches" even though it may not be really be called that. You can see it all over the internet. Pokey knows.
Not that there are many trails around Clover Springs but a lot of us call that "above the Nile" since that area is kind of away from anything else. Again not it's real name but local wheelers know where that is.
You could just put all the places under the different PNW4WDA Regions and then use the trail numbers to talk about them. Of couse Beverly, Moses Lake and Juniper would have to still be called areas.