"Couldn't remember all the goblin rebels' names, so I invented a few.... It's all right, they're all called stuff like Bodrod the Bearded and Urg the Unclean; it wasn't hard."
-- Ron to Mrs Weasley after the History of Magic exam (GF31)
Rebel leader in the goblin rebellions of the eighteenth century.
Other canon notes and references
Also mentioned in the third W.O.M.B.A.T. test posted on jkrowling.com as a possible answer to the question "Which of the following did NOT provoke one of the bloody goblin rebellions of the 17th and 18th centuries?"According to the test Urg was a goblin activist who might have been ducked in a pond by a gang of young wizards (JKR); unless we get answers to the test someday, the ducking cannot be considered canon.