Siouan place name

["Alfred W. Tüting"]

  That's what I could find about it:

• Elkhorn. The town of Elkhorn or Elkhorn Station takes its name from
the Elkhorn river which empties into the Platte river a short distance
from the town. It was incorporated by an act of the legislature approved
January 22, 1856. Ta-ha-zouka (Elk's Horn), from whom the Elkhorn river
takes its name, was associated with Blackbird, also an Omaha chief, in a
treaty with the Spanish Governor-General of Louisiana in 1796.

See also:
http://www.elkhornvalleymuseum.org/newsletter03-2a.htm

Alfred