Hello WBC21,
Thank you for using Apple Support Communities. It's our understanding that only phone numbers appear for missed calls on your iPhone SE. We're happy to help.
If you haven't already, make sure that your iPhone has the latest software version and carrier settings. Update your iPhone, iPad, or iPod touch
Manually update your carrier settings on your iPhone or iPad
If the issue persists, let us know if this occurs with all callers or a specific contact. Please include any other troubleshooting steps that you may have tried.
Have a wonderful day!