'Full Name for Messages' Makes the Messages App Show the Full Name of Your Recipient
One of the annoying default parts of iOS 7 is how the Messages application only shows you the first name of the person that you're messaging at the top of the application. It can become confusing, because if you have more than one friend with the same first name, then you'll quickly become baffled by who you're actually talking to.
A new free jailbreak tweak called Full Name for Messages
by iOS developer Dan Saba forces the iOS 7 Messages application to show the full name (first and last) at the top of the application while you're text messaging or iMessaging them, as shown above.
There was a point in the beta stages of iOS 7 that Apple experimented with displaying only the first letter of the person's last name after the first name, but it looks like Apple finalized iOS 7 with the decision that only the first name should display. This tweak does a good job of restoring the functionality that we had in older versions of iOS, and makes it a lot easier to identify who we're actually talking to.
If you want to give Full Name for Messages a try, it's available for free in Cydia's BigBoss repository. The tweak requires iOS 7 to be installed and has no options to configure; just install it and you're ready to go.
Note: You can enable full names throughout iOS as a whole by disabling the "Short Names" feature under Settings>Mail, Contacts, Calendars. This tweak only affects the Messages application, and not iOS as a whole.
Full Name for Messages
iPhone 5 running iOS 7.0.4