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In page Derby:

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The Viking name Djúra-bý, recorded in Old English as Deoraby, means "Village of the Deer". However, the origin of the name 'Derby' has had multiple influences; a variation of the original Roman name 'Derventio' with pronunciation of the letter 'v' as 'b', becoming Derbentio, and later Derby, along with a link to the river Derwent – from the Celtic meaning "valley thick with oaks"[3] – which flows through the city, triggering a shortened version of Derwent by, meaning 'Derwent settlement'.