Good afternoon Hgwellsworth,
Welcome to the Apple Support Communities!
It sounds like you are seeing "Unknown Caller" instead of a phone number for calls that are unrecognized by your iPhone.
If this is affecting a few people who are in your Contacts, verify that they haven't disabled Caller ID on their device.
The resources below will help you with this:
Check for iOS and wireless carrier updates:
Update your iPhone, iPad, or iPod touch
Update your carrier settings on your iPhone or iPad
Detect and block spam phone calls - Review the section "Turn on Silence Unknown Callers"
Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch
"If you're in the Phone app under Recents, tap the Info button
next to the phone number or contact that you want to block. Scroll down, then tap Block this Caller."
Take care.