While watching the movie, Hedalgo, they mention the Mustang is a Spanish word for American Wild Horses because they are restless.
Using Sanskrit, the same meaning is derived.
Maa - Prefix for Not
ast - Settled (This is the basis for the root "East" where the uninitiated kept the map "upside" down, moving from South Facing importance to North Facing importance).
aNG - Body. Here "NG" is Guttural Nasal.
The body that does not rest, is the Restless Mustang.