There is no standard name for it, which is a great shame, since it is my favorite!
Some of us (myself included) occasionally refer to it as jockey or rear entry showing off our familiarity with sexinfo101, because i doubt any of us had heard the term jockey before :p Rear entry as per its definition her legs are a little more open then i would normally imagine, and jockey he's a little more upright.
I think it lacks a name because its not common in p*rn (probably because you can't see her that well) so it isn't discussed in that context much?
I think I've heard it doesn't work all that great if the guy is short.
this is a common variation of the spoons position-some women like it because the weight of the guy they are with is not all over them and they can concentrate on their and your **** sensations better---so enjoy!-it can also be done laying on your sides and can even go into a scissors type position as well