What is the origin of the name Stonehenge?

A “henge” is a type of celtic/neolithic structure usually made of dirt and timber. Stone henge is made of well, stone.

I don’t think anyone knows who named it. For that matter, we don’t even know for sure who built it, do we?

My husband and I went to Stonehenge thinking it would be hokey, and indeed there’s a tourist center on the other side of the road that offers way too much junk along with useful things like audio guides. The henge itself was utterly magical, even cluttered with people exactly like us who had arrived by internal combustion engine-powered vehicles and were sitting around listening to these devices. It’s too magical to be belittled by anything we can do to it.
Later, on the road again, we came to a sign for a place or thing called “Woodhenge” so we went there and read a roadside sign that said there used to be an enclosure there made out of stumps.
But that was long ago and stumps don’t last.
Later we passed a harvested field and both exclaimed at the same moment, “Look! Hayhenge!”