It's possible that:
* The name is misspelled: Perhaps the author's name is similar but slightly different. Could you double-check the spelling?
* The author is less known: It's possible the author is not widely published or known outside a specific niche.
* The author is using a pseudonym: Some authors use pen names.
If you can provide any additional information, like the genre the author writes in, a specific book title, or any other details, it might help identify the correct author.