Dun

Proper noun

 * 1) A river in Wiltshire and Berkshire, England, which flows into the River.
 * 2) A river in Wiltshire and Hampshire, England, which flows into the River.
 * 3) An alternative name for the River  in Yorkshire, England.
 * , alternatively named the Glendun River.

Etymology
Potentially attested as dun in 1233, attested with certainty as de dunne in 1452. Etymology. Not derived from.