You're kidding right? Gauss is a unit of measurement, it doesn't need to reference the earthling Carl Gauss, the same way equipment named after historical names, or names of weapons and armor from other languages don't have to reference those cultures.

-Dragoons are based on french light cavalry, France doesn't exist in Eorzea.
-Katanas and Ninjas are from Japan. Japan doesn't exist in Eorzea.

A Gauss is the centimeter-gram-second unit of magnetic induction, equal to the magnetic induction of a magnetic field in which one abcoulomb of charge, moving with a component of velocity perpendicular to the field and equal to one centimeter per second, is acted on by a force of one dyne; 1 maxwell per square centimeter or 10− 4weber per square meter.