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In page Duisburg:

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The first syllable of the name of the city could go back to the Proto-Indo-European root *dʰeus-, meaning something like "wet area" or "flood plain".[citation needed] Duisburg therefore could mean "fortified place in the floodplain". Another interpretation assumes that the name is derived from the Old German "duis" which means "hill".[citation needed] Duisburg could mean something like "castle on the hill". Thus, a place on a hill overlooking the Rhine, that could refer to the area of the present Town Hall. Duisburggau (Diuspurgau) was also the name of the medieval Gau (country subdivision) on the Lower Rhine.