I don't like the name Wild Horse much. Well, it is on the Rez, so.... What if Charlie Allen had named it Maricopa County Int'l Raceway? MCIR.... heh
OK, I looked up "maricopa" and it sez that was the name of a Native American tribe out of the Gila Valley (south of Phx). More trivia: if ya go downtown by Sky Harbor Airport, there is a museum. The people who lived in & around the Phx area were called Hohokum by the Native Americans who lived in Phx in the 1800's. The name means "all used up", cuz they just left the area for whatever reason about 400 years ago, after being here for 1000 years. Drought? They had a trade route that went up into Utah, New Mexico, Mexico, parts of Calif, etc. Also dug the canals that are still in use in Phoenix.