From Wiki - "The 9×18mm Makarov is a Soviet pistol and submachine gun cartridge. During the latter half of the 20th century it was a standard military pistol cartridge of the Soviet Union and the Eastern Bloc, analogous to the 9×19mm Parabellum in NATO and Western military use."
9x19mm Parabellum ammo is the same as 9mm Luger ammo, just a different name
Then there is the 9x25mm - The 9×25mm Dillon is a pistol wildcat cartridge developed for use in USPSA/IPSC Open guns. The cartridge is made by necking down a 10mm Auto case to 9 mm.
Then there are these 9mm pistol cartridges:
NAME Bullet diameter
.380 ACP 9.02 (.355)
9×18mm Ultra 9.00 (.354)
9mm Glisenti 9.02 (.355)
9×19mm Parabellum (9mm Luger) 9.02 (.355)
.357 SIG 9.02 (.355)
9mm Browning Long 9.09 (.358)
9×21mm 9.02 (.355)
9×21mm Gyurza 9.05 (0.356)
9×23mm Largo 9.00 (.355)
9×23mm Steyr 9.02 (.355)
9mm Largo 9.02 (.355)
9×25mm Mauser 9.02 (.355)
9×25mm Dillon 9.02 (.355)
9mm Winchester Magnum 9.02 (.355)
9×25mm Super Auto G 9.03 (0.356)
.356 TSW 9.04 (.356)
.38 ACP (.38 Auto) 9.04 (.356)
.38 Super 9.04 (.356)
9×23mm Winchester 9.04 (.356)
.38/.45 Clerke 9.1 (.357)
9×18mm Makarov 9.25 (.364)
Info Overkill?