Here's the location for the Cushing/Cusyn/Limisi/Toescini stuff:
Here's something that helps, I hope: de Limisi derives from Limesy, France. Toescini (among various other spellings like Toeini, Toenini, Toesini, etc.), derives from a place now known as Tosny. These are both near Rouen in France which matches up with the fact that one of the early folks with the Toescini name was the brother of the archbishop of Rouen.