It was actually invented by a Prussian, but the name "Neopolitan" originated in America: https://en.wikipedia.org/wiki/Neapolitan_ice_cream

The first recorded recipe was created by head chef of the royal Prussian household Louis Ferdinand Jungius in 1839, who dedicated the recipe to Fürst Pückler.[3] To this day, the German name for Neapolitan ice cream is Fürst-Pückler-Eis.

Sounds yummy