Chicago 18th Author–Date style inserting first names in in-text citations

I’m running into what appears to be an issue with the Chicago Manual of Style 18th edition (author–date) citation style in Zotero.

When I insert a parenthetical citation, Zotero outputs the first name of the first author, which does not appear to match Chicago author–date formatting rules.

For example, Zotero produces:

(Christopher Ansell et al. 2020; Emerson et al. 2012)

But according to Chicago author–date guidelines, the citation should be:

(Ansell et al. 2020; Emerson et al. 2012)

So the first name “Christopher” should not appear in the parenthetical citation.

Details:

Style: Chicago Manual of Style 18th edition (author–date)

Zotero version: 8.0.3

Word processor: Microsoft Word

The issue appears consistently when I cite more than one multi-author works.

I do not come across this issue when citing a single work that has multiple authors. Additionally, this does not appear to be an issue in another citation format (like APA).

Has anyone else encountered this behavior, or is there a known issue with the CSL file for Chicago 18th author–date? I’m wondering whether this might be a style bug or some kind of disambiguation rule being triggered incorrectly.

Thanks for any guidance.
  • This is a disambiguation mechanism. Chances are that you are citing another item by Ansell with a slightly different form of the name:

    https://www.zotero.org/support/kb/given_name_disambiguation
  • Can you confirm that this happens in a new document with just those two citations (i.e. Ansell et al. 2020 and Emerson et. al. 2021)?
    Can you also confirm that it _doesn't_ happen if you just cite Ansell et al?
  • Thanks for the suggestions — this turned out to be a disambiguation issue.

    I had another item by Ansell where the author's name appeared as “Chris Ansell” instead of “Christopher Ansell.” Because of that variation, Zotero added the first name in the citation to distinguish between the entries.

    After standardizing the author names in my library, the citation returned to the expected format (Ansell et al. 2020).
  • Yeah, I thought this was likely it. Chicago is silent on this exact case, but we think what we implement is the appropriate disambiguation rule for the Manual. APA actually specifies that authors with the same last name and initial should _not_ be disambiguated.
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