Unfortunately we're not able to use the alias field in name formats but you can use the nickname from a constituent's record in name formats.

Configure a Nickname
  1. Click Constituents > Constituent Search > Search for and select the Constituent 
  2. Click on the Personal Info > Personal tab > Click edit
  3. Enter a nickname and click save
Create a Name format 
  1. Click Marketing and Communications > Name Format Options
  2. Click on the Name Formats tab > Click add
  3. In the field column choose Nickname
  4. Click save
This name format will now be available for selection within your name formats. To choose the name format on a constituent record:
  1. Click Constituents > Constituent Search > Search for and select the constituent
  2. Click on the Personal Info > Personal Tab
  3. Click the arrow next to a name format and click edit
  4. Choose the Nickname format in the list and click on it
  5. Click the green Select button > Click Save