The name Parabellum, used for the 9mm Parabellum pistol cartridge is derived from the Latin:
Si vis pacem, para bellum
If you seek peace, prepare for war.
which was the motto of Deutsche Waffen- und Munitionfabriken (DWM) (German Weapons and Munitions Manufacturer).
The cartridge was developed in 1902 for the 9mm Luger, designed by Georg Luger and DWM.