Hi SSaunders22,
To clarify the information from the previous article shared. Ask Siri, Dictation & Privacy
"When you use Siri and Dictation, your device will send other Siri Data, such as:
• Contact names, nicknames, and relationships (for example, “my dad”), if you set them up in your contacts
• Music and podcasts you enjoy
• Names of your and your Family Sharing members’ devices
• Names of accessories, homes, scenes, and members of a shared home in the Home app
• Labels for items, such as people names in Photos, Alarm names, and names of Reminders lists
• Names of apps installed on your device and shortcuts you added through Siri"
As there is no setting listed in Settings > General > Keyboards we recommend you check Settings > Siri & Search to see if you had 'Show Contact Suggestions' enabled. If the latter didn't resolve the issue, it's possible there is no feature where this can be disabled.
Again, you can reach out to Apple Support directly to further assist.
Additionally, you can leave feedback here: Product Feedback
Take care!