Shrimp Louie, or Louis?

MM made a great salad for dinner and called it Shrimp Louie.  Wikipedia didn’t have an entry for Shrimp Louie or Shrimp Louis, but several recipe sites confirmed the name.  I had to look it up because the last time he cooked eggs with bell peppers he called it Eggs Florentine, but Eggs Florentine requires spinach!