Earlier quoted context omitted.
Assuming they dont just have the same name but are intentionally impersonating you - sounds like fraud, false advertising or identity theft [ianal]
The example book just has the same name. It should be defensible; you can write under any name you want. Amazon itself is the entity attributing the book to the more famous Jane Friedman. This is a case where the "impersonator" appears to be legally fine and Amazon is on questionable ground.
It sounds like maybe this is not happening? If they are just appearing under the search for “AuthorName” I am not sure there really is a problem with Amazon’s system.
IANAL, perhaps Amazon still has some liability if an author is using a fraudulent pen name for books they submit.