GTA V Locations Names for San Andreas
Los Santos only

Installation:
Place the american.gxt to your (SA game directory)\text folder.

Changed Places:

Ganton -> Davis
Idlewood -> Strawberry
Jefferson -> Rancho
Mulholland -> Vinewood Hills
Pershing Square -> Legion Square
Willowfield -> Banning
East Beach -> Cypress Flats
Los Flores & Las Colinas -> La Mesa
Ocean Docks -> Port of Los Santos
Glen Park -> Mirror Park
Rodeo -> Rockford Hills
Santa Maria Beach -> Del Perro Beach
Verona Beach -> Vespucci Beach
Temple -> Burton
El Corona -> South Los Santos
Little Mexico -> Pillbox Hill
Market -> Hawick
Verdant Bluffs -> Pacific Bluffs
Angel Pine -> Paleto Bay

Richman, Vinewood and Downtown Los Santos were unchanged.
 
V2 Updated!
More places:
Conference Center -> La Puerta (as the location is near the highway)
The Panopticon -> Palomino Highlands
Hunter Quarry -> Davis Quartz
Verdant Meadows -> Sandy Shores Airfield
Fort Carson -> Grapeseed
Flint County, Red County and Bone County -> Blaine County

Mount Chiliad was unchanged.

V2 is the last update, no more improvement after this update.