* The name is misspelled. There may be a similar name that you are thinking of, like "W.A.J. Luxemburg", "W.J. Luxemburg", or "W.A. Luxemburg."
* The author is less known. The author might be a niche writer, possibly specializing in a specific genre or language.
* The author might not be a published author. Perhaps the name belongs to a writer who has yet to publish or only published independently.
To get more information, you could try:
* Double-checking the spelling.
* Providing additional context. For example, what kind of books did you think the author wrote?
* Searching online databases like WorldCat or LibraryThing.
Let me know if you have any more information, and I'll do my best to help!