Full name field on node using Display Suite
It sounds like you need a field formatter. You have a few options:


Use Drupal's mechanism and create one yourself.
Use the Custom Formatter module to create a custom formatter.
Use Display Suite to create a custom code field.


If you aren't comfortable with coding, options 2 and 3 are good choices. Option 1 is leaner since if you already have a custom module it wouldn't add the overhead to your site of enabling another module.