It's possible that:
* The name is misspelled: Double-check the spelling and try searching again.
* The author is less known: You might try searching for variations of the name, or researching specific genres or time periods where they might have written.
* The author might be a pseudonym: There could be a more well-known author who used this name.
Could you please provide any additional information about Alphonse Leclaire, such as the genre of their work or any books you know they have written? This will help me narrow down the search and give you a more accurate answer.