I've deliberately kept out of this (so far) because I've been down this road before - trying to think of a suitable name for a collective concerned with the conservation of ancient remains - and know how difficult it is to come up with a title that everyone can agree with.
In my experience, whatever is suggested, someone will have some objection.
I don't think that there is a snappy and short answer to this. Whatever name we do come up with, i believe that it should state exactly what we are about.
There are already two pagan-led initiatives, which are:
ASLaN - Ancient Sacred Landscapes Network (I don't like this one)
S.O.S.S. - Save Our Sacred Sites (Not bad, but it's got 'Sacred' in it)