How can we include names in notifications rather than e-mail addresses

When sending notifications to End users and Support staff ServiceDesk inserts the users e-mail addres rather than First Name + Surname of Display Name.

For example ..

"Hi  Joe.Blogs@domain.com"

"Hi j.blogs001@domain.com" 

Although this is not so much of a concern for Assignees this is not a form of address used when addressing customers.

Are we able to inlclude names in notifications rather than e-mail addresses without using the email workflow?