Lewis Ankeny McArthur, Oregon Geographic Names (1952)
“ Umpqua is an historic name in the state. It was used by the Indians to refer to the locality of the Umpqua River and came to be applied to Umpqua River. For a discussion of the name see under UMPQUA RIVER. There have been several places known as Fort Umpqua. John Work visited the Umpqua River in 1834 and Fort Umpqua, which was later established by the Hudson's Bay Company near the present site of Elkton, did not then exist. ”
