Who found and named Devil's Garden?

In the early 1920s, an immigrant prospector from Hungary named Alexander Ringhoffer came across the Klondike Bluffs, a similar area with fins and arches to the west of Salt Valley, which he named Devil's Garden. Ringhoffer contacted officials at the Denver and Rio Grande Western Railroad to determine whether the land could become a tourist attraction. The railroad company realized the lucrative potential of the area and contacted the National Park Service to consider making it a national monument. President Herbert Hoover signed an executive order on April 12, 1929 that created Arches National Monument. The monument originally consisted of two parts: the Windows and Devils Garden, with the latter name being taken from Ringhoffer's name for the Klondike Bluffs, an area not initially included in the park. Arches remained a national monument until 1971 when Congress passed a bill that re-designated it as a national park.

Alexander Ringhoffer came across the area that he then named Devil's Garden.