A risky matter using placenames to infer standing stones. Even where we have record of standing stones they ain't necessarily so, with e.g. Redland Stone and the Stanemora stones now known to have been part of chambered cairns (the former named Redland North chambered tomb, the stone itself destroyed in the late 19th century) and the Stanerandy stone pair now Stanreandy Tumulus. If the stones had been destroyed without record of their situation they would still be down as standing stones. And even where there are standing stones to fit the placenames these themselves might still be named after areas of natural stones or other kinds of site - I imagine we assume a connection on our own sensibilities on at leat a few occasions.