According to Cosmos, it was the first program to bounce radio waves off the Moon.  And, despite being in the '40s, they called it after a girl.  Yes, moonlight is really reflected sunlight, but I don't care.  All the justifications I've ever seen kind of gloss over the fact that it makes more sense to name the mission after a female than a male in this particular instance and they didn't do it.  "Oh, it was the times"--yeah, so was Operation Diana.