Thanks. But, well, I have heard that explanation a lot, and somehow I am not satisfied with it. As a surname, it doesn't mean anything, and especially for the practical Germans. A name like Beautiful Evening is like a Native American name, like Running Deer. Germans just wouldn't do that.
I believe the pronunciation of the words have altered so much down through the centuries, that perhaps they were originally very different words. It might have been Oben Schon, or "already above," as in the case of people who lived on a precipice or cliff above a village or road. (Some Britons were called "Shelf" because they lived on an overhanging cliff.)
Or maybe very, very totally different words altogether.
Another idea might have been Abend Schein, or Evening Light, as in people who lived in the distant horizon lands where the sun set. Still, that is too poetic or artsy for a German surname.
I guess we will never know. But if someone could find a practical way to apply the proposed "Beautiful Light" to a family as their meaningful surname, it could mean that. Like, for instance, what if a person was a lamp lighter, and lit lamps were so novel that they were called Beautiful Light. (Stranger things have happened! i.e., American marketing and product names! "Lucky Strike" cigarettes is a weird example. Or calling a soft drink "Sprite," when the word sprite means small or elusive supernatural being.) So, just as an example, what if Beautiful Light was a slang term for street lamps? I am not proposing that, just using it to illustrate the point.
So, somehow, the words, whatever they originally were, had to be applied in a meaningful fashion, for it to become a surname.
I have a friend whose last name is Fivecoat. It is an Anglicization of the German name Funfrock, which means, literally, "Five Coats." He has spent years trying to figure that one out. I mean, it has stuck for centuries now. So the first one must have owned five coats. But that is too simple; reminds me of Davy Crockett's Cherokee friend, Charlie Two-Shirts. Maybe there is a more sophisticated explanation for calling a person "Five Coats."