* The name is misspelled: Could you double-check the spelling? Perhaps it's a similar name like "Ross Macdonald" or "Tharaud" (which would be a surname)?
* The author is relatively unknown: If this is a newer or less famous writer, they may not have a Wikipedia entry or other readily available information online.
* The author may use a different name: Some authors use pseudonyms or have published under different names at different times.
Could you provide any additional information, like the genre of their writing, approximate year of publication, or any other details you remember? This might help me find the author you're looking for.