In iOS 7, the Lock Screen and Messages app no longer displays the full name of contacts you’re having a conversation with. Instead, by default it now only shows the first name. This is great for making the user interface look tidy, but it can cause confusion when having conversations with multiple people of the same name. Thankfully it’s easy to restore contact names back to their full length. Read on to see how it’s done.
1. Settings app
Open the Settings app, Select Mail, Contacts, Calendars then select the Short Name option.
2. Short Names
Choose the setting you prefer. You can choose from First & Last Initial, First Initial & Last Name or just Last Name Only.
3. Short Names Off
Alternatively, you can turn Short Name off from the top of this setting pane to show the full name of every contact.