 The county, also called "Osi Kaunti", from the Choctaw word "osi", or eagle, took its name from Eagletown, the county seat.Eagletown was an important trading post in the region and was the site, from 1834, of a U.S. post office.Eagle County was one of the original 19 counties created by the General Council of the Choctaw Nation in 1850.