'Ville' translates as "town" so "Green Town" :)

Similiarly in the UK 'Downs' is an old english word for hill so I'm always amused by a local 'Highdown Hill' ("HighHill Hill").

“Las Vegas” means the meadows. The Spanish were usually pragmatic when naming locations on their maps, e.g. Del Rio, El Paso (de Norte), and Presidio in Texas; Salida, La Junta, and Pueblo in Colorado; the Sierra Nevada in California; and El Camino Real’s everywhere.