Rancher is a "cut" non-player character still present in the game's files of Fallout: New Vegas.
The GECK has listed two male and 1 female character. One male and the female are class soldier, the other male is a class adventurer.
Being ranchers, they clearly were intended to have their place somewhere in Mojave Wasteland around New Vegas.
Ranchers were added during the development stages of Fallout: New Vegas, but were cut from the final retail release of the game.