Naming convention for a voltage follower op amp
is there a well accepted naming convention for this

No.

Make up whatever you want.

If the output of the voltage divider only goes to the opamp, then one way to deal with this is to put both on the same page and connect them directly.  That alleviates the need to name the "raw" net at all.

If I was forced to name both nets, I might pick something like V1RAW and V1BUF, but really, that's up to my whim at the time.  As long as the names at least remind you of the function and aren't terribly verbose, they'll do.