I have done 2 4+ trails in Moab and 1 4.
Once you start doing trails at that level you can't help but know the names. 4 and 4+ trails are something even the most humble 4-wheeler wants to brag about, so someone with the ego the size of an H2 owner would never do a 4+ without knowing ever detail possible so they could brag about it later. It just doesnt happen. I can see why you wouldnt care about names when driving down dirt roads in Baja, but once you granduate to real trails you will understand what I am talking about.