The script for Star Wars: The Force Awakens has hit Reddit. Supposedly the script is the WGA copy. At the end of the film, when Rey finally reaches Luke Skywalker, the script calls the planet:
EXT. AHCH-TO ISLAND
The script has a few errors in it here and there (such as Poe’s name being under his lines in the Lor San Tekka sequence). But it appears to most likely be real. There is a chance the name could be changed by now and isn’t correct or Rian Johnson features the location more than Abrams did and came up with a new name for it. But more than likely that is the name. We recently ran a bit about this exact place for the sequel.
Thanks to The Star Wars Post for pointing this out!