I'll admit I'm not all that thrilled with the name "Monterey" for the next version of MacOS. But it gave me the idea to list out some suggestions for future versions. Note... this is intended to be at least somewhat humorous. 
MacOS Trinity (after the Trinity Range in northern California)
MacOS Hetchy-Hetch (after the reservoir the greenies are trying very hard to drain despite California being very short on water)
MacOS Joshua Tree
MacOS Shasta (no, not after the beverage)
MacOS Lassen Peak
MacOS Mammoth Lakes
MacOS Kings Canyon
MacOS Dusy Ershim (after the Dusy-Ershim 4x4 trail near Kings Canyon)
MacOS Rubicon
MacOS Barstow (why not?)
MacOS Stockton (also why not?)
MacOS Skid Row (can you imagine the wallpaper they'd include with this?)
Specifically, Death Valley-inspired ones:
MacOS Eureka (after the Eureka Sand Dunes)
MacOS Crankshaft (after Crankshaft Junction)
MacOS Ubehebe (after the crater)
MacOS Racetrack (after the playa with the mysterious moving stones)
MacOS Panamint (after Panamint Valley)
MacOS Furnace Creek
MacOS Badwater (after Badwater Basin, the lowest point in the US)
So... ultimately, I think they could have done better than, "Monterey." But whatever. Feel free to add your own ideas!
Rob
MacOS Trinity (after the Trinity Range in northern California)
MacOS Hetchy-Hetch (after the reservoir the greenies are trying very hard to drain despite California being very short on water)
MacOS Joshua Tree
MacOS Shasta (no, not after the beverage)
MacOS Lassen Peak
MacOS Mammoth Lakes
MacOS Kings Canyon
MacOS Dusy Ershim (after the Dusy-Ershim 4x4 trail near Kings Canyon)
MacOS Rubicon
MacOS Barstow (why not?)
MacOS Stockton (also why not?)
MacOS Skid Row (can you imagine the wallpaper they'd include with this?)
Specifically, Death Valley-inspired ones:
MacOS Eureka (after the Eureka Sand Dunes)
MacOS Crankshaft (after Crankshaft Junction)
MacOS Ubehebe (after the crater)
MacOS Racetrack (after the playa with the mysterious moving stones)
MacOS Panamint (after Panamint Valley)
MacOS Furnace Creek
MacOS Badwater (after Badwater Basin, the lowest point in the US)
So... ultimately, I think they could have done better than, "Monterey." But whatever. Feel free to add your own ideas!
Rob