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Phil, the answer may lie in the name Dubris Dovorum. However, the dictionaries so far consulted do not give any explanation of this full name. If I am right, Dubris Dovorum should be the full name, and Dovorum is the Latin genitive plural case of Dovor. It means: Dubris of the Dovorians.
Dour, our river, derives its name from the same word origin, and actually means: river. Whether Dovorian is a derivation of Dubris, and originally refers to the inhabitants of our town, is still object of research on my part. Yet, the people here were part of the Cantici, the Celtic tribe deriving its name from Kantion, Kent. (Also Canterbury, which comes from the Celtic Kent and the Anglo Saxon: people and burgh. Cantarabyrig, meaning: town of the people of Kent.