Messages no longer show the people associated with each messa

Hi Beechwood Blue,

Here is an article for deleting contacts on your Mac:

Delete contacts or contact groups in Contacts on Mac

Then here is a an article for syncing contacts to your Mac:

Add contacts from iCloud, Google, and more to Contacts on Mac

Cheers!

Hi Beechwood Blue,

Thank you for using Apple Support Communities. I understand that in messages you are no longer seeing the person's name for the message thread. I know that makes it very difficult to message the correct person. I have a few questions so that the community can better answer your question.

Which device is this happening on?

Have you recently added or removed a mail account?

Were there any changes that happened prior to this issue that you noticed?

If you go into the Contacts App on your device and they do not appear there this article may help you find them again

Manage and delete contacts on your iPhone, iPad, or iPod touch

Cheers!