Listed participants for a new meeting

[BrianTVT]

I just set up a new meeting for a recurring group and was confused when the invitation listed several participants, even though I invite people by email and not directly via Zoom.  The list included 9 people: myself, plus 7 named individuals who are part of this group and one more, identified by the initial 'D' and no other identifying info. other than "Not invited before meeting."  Where did that come from and how can I delete it?