Erroneous addition of author's first name in parenthetical citations

For some sources when I insert a University of Chicago Author-Sate style parenthetical citation into Word 2004 using the Mac plug-in, it will say (David Pimentel 2004) instead of just (Pimentel 2004). I.e. the first name should NOT show up for a citation. For some reason it is including the first-name field erroneously; what can I do to fix this? Is this a known problem? With a known-workaround?

Thank you!
Cameron Erens

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