According to the wikipedia article about Charles Hayden, he was
Instrumental in the financing of Arizona copper mines and smelters, the smelting community of Hayden, Arizona was named for him.
This is corroborated by such sources as The Encylopedia of Arizona, page 172, local civic booster publications such as this one and an entry on Hayden on a find a gravestone site. (This last gives him a middle name, "Willard", which is not present on his tombstone or in his New York Times obituary.) The "named after" claim is not given in his NYT obituary.
Note that the eponymic Charles Hayden (financier, philanthropist, donor of the Hayden Planetarium) is not the same person as Charles T. Hayden, important in Arizona history as a founder of the city of Tempe and of Arizona State University.