Re-Engraving Marble Wall Sign

Can you please tell me whether it is possible to cover up a name that has been engraved in a Marble (http://www.lightemprador.com) wall sign and (http://maplered.com) re-engrave another name.. The reason I ask this question is because I will be replacing an attorney who is leaving an office suite and (http://maplered.com) the other attorney's name is engraved into the Stone (http://g603.net) along with the other people in the office. Is there a way to engrave my name on the placque?

Thank you for your assistance..

Jonathan S. Friedman (JFEagle99@aol.com)