If WhatsApp is only showing phone numbers and not contact names, here are some fixes you can try.
Is WhatsApp not showing you the names of your saved contacts? The issue usually occurs with a specific contact you’ve recently saved. Other times, it affects all the contact names in your phone’s address book. Where does this issue come from, and how can you fix it?
Why Does WhatsApp Stop Showing Contact Names?
WhatsApp stops showing contact names for various reasons. Here are a few of them: