It's possible:
* The name is slightly different: Double check the spelling of the actor's name.
* The actor is relatively unknown: He might have been in small roles or indie projects that haven't gained widespread recognition.
* The actor is new to the industry: He might be starting his career and hasn't appeared in major projects yet.
If you could provide more information, such as the year of release of a project he was in, or a specific role he played, I might be able to help you further.