Update Username in a Names field that allows mutiple values

I have  project tracking database that lists team members in a Names field that allows multiple values.

My question is this.  When someones name changes, is there a way to have a script or agent run at night to go to the address book or library database and update the name with the new name.

Field: prjTeamMembers, Names Field allows multiple values.  Uses the NAB

If I have a list of team members, Susan Smith, John Johnson, and Taylor Thomas - I am wondering if Susan Smith's name changes to Susan Anderson, is there something I can write that at night that would update her name to the correct name? Or does this have to stay as a manual process and someone has to go in and update the field.

Any help is always appreciated.  Thanks!