Chicago Author-Date problem

Hi, anybody got an idea?

Biggs, Michael A. R. 2004. Introduction: The role of the artefact in art and design research. http://www.herts.ac.uk/artdes1/research/papers/wpades/vol3/mbintro.html.

is a journal article and is other than all my other references inline quoted as (Cf. Michael A. R. Biggs 2004) i.e. with first name. I seem to be unable to make Zotero suppress the first name. Yes, it is in its own field; yes, I tried other item types, what else can I do?

Thanks for your help!
Michael
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