The name "Derwent" means "a valley thick with oaks". The Romans had an encampment called Derventio on the banks of the Derwent at what is now Derby (Derby, England). The Roman spelling was Darwent. The Derwent Reservoir is located at the Derwent Valley, downstream of the Howden Reservoir. The river flows on through Derby.
The Derwent River, Tasmania was named after one of the River Derwents.
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While obviously named after one of the English RiverDerwents, the name - which apparently means "valley thick with oaks" - is especially appropriate.
Several bridges connect the western shore (the more heavily populated side of the river) to the eastern shore of Hobart - in the greater Hobart area, these include the five lane Tasman Bridge, near the CBD, just north of the port; the four lane Bowen Bridge; and the two lane Bridgewater Causeway.