It's possible that:
* You may have misspelled the name. Double-check the spelling to see if you can find the correct name.
* The individual might be involved in smaller projects. They may have worked in independent films, short films, or local theater productions which are less documented.
* They may be a newer talent. New actors sometimes start with smaller roles and might not have gained widespread recognition yet.
If you have more information about the person you're looking for, like a specific movie or role they were in, or their age and location, it might help in finding more information about them.