Paul/Greg,
Victor (Hal Croves) may have the file you're looking for. I remember he'd identified the guy who did all the naming for the Apache Trail as a Prof. Aubrey Drury ...working for the Southern Pacific and their auto-route on the Mesa-Roosevelt road. He had a thread on here a few years back and it appeared to me at least that Victor had the Prof's files, or had contacted someone that did.
As background, all geographic place names in the USA are decided by the US Board on Geographic Names. It was named a little differently back when these place names were submitted, but essentially did the same thing. Once the board makes a decision on a place name, all US Gov't entities are obligated to comply. This is how most place names get onto USGS or other gov't maps.
It appears to me that the good Prof. submitted these SPRR place names to the Board around 1917...or at least, that's when the board appears to have first approved them...the 1917/1918 time-frame.
At some point around 1932, the USFS asked the board to vacate many of the place names we see on or near the Apache Trail. The board complied and many of these place names were vacated in 1932/1933 time-frame. Coronado Mesa was vacated as a place name as of 01/01/1933.
The funny part is that the USGS has gone back and is re-using some of these vacated place names on modern maps...such as Coronado Mesa. They are using them as "historical" place names, even though the board had vacated them in the 1930's.
This makes me wonder if at some point they are going to ask the board to re-name them with their "historical" names?
Here's a snippet of the geographical place names around the Apache Trail that were vacated:
View attachment 2109085
This data came from the AZ USGS place name database that they use on their maps.
Attached as a text file is the complete set that I took from their database that I saw were vacated in that area.
From what Victor had found, it sounded like the Prof. had gotten many of these place names from the locals, such as Geronimo Head. So perhaps he has something in his files that might give a date, or source, for the naming of "Coronado Mesa".