Send them an email stating as much. If they are truly defaming you--you can sue the domain registration company and seek an injunction/subpoena of their records.
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If they are guilty of cybersquatting, you may have a cause of action against them. Further, you have the sole right to publicity using your name. So you start with a cease and desist, followed by a lawsuit for defamation and cybersquatting if they do not comply.
Is this "someone" someone you know or just a random stranger. It is material to the analysis.
Don't act hastily. You may want to find out who they are before taking anything down. Contact an attorney to discuss further.
The response above is general information related to law and not intended as legal advice since it’s impracticable to provide thorough, accurate advice based upon the query without additional details. It is highly recommended that one should seek advice from an attorney licensed in your jurisdiction by setting up a confidential meeting. Moreover, this response does not constitute the creation of an attorney-client relationship since this message is not a confidential communication because it was posted on a public website, thereby publicly disclosing the information, which is another reason to setup a confidential meeting with an attorney.
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