If you wish to change the Display name on your Hosted Exchange account, please follow the details below.
1. Login to your account online at https://owa.exchange2go.com/owa
2. Once logged in. Go to Options
(top right corner) > See All options
3. Under the Account
tab on the left, click the Edit
4. This should open a new Window. From here you can edit your Name / Display Name. Once done, click Save.
Once saved, you will need to allow some time for this to sync up with your devices.