Anybody know the reason for the ‘Star Wars’ themed STARs into KATL?
It's a long established practice for the procedure developers to build the procedures around a theme. It helps with coming up with the necessary distinct pronounceable names for the waypoints.

My personal favorite is the RNAV (GPS) RWY 16 approach into KPSM. Flying from the IAF to the MAP and the Missed Approach Holding waypoint you fly:

ITAWT --> ITAWA --> PUDYE --> TTATT --> IDEED

which mimics Tweety Bird's comment when he sees Sylvester the Cat chasing him (for those readers who didn't grow up watching Warner Brothers cartoons).