Where does “Cornwallis” come from?

Cornwallis (Dutch) comes from English Cornwallis, from Old English Cornwealas, from Old English Wēalas, from Old English wealh, from Old English īeġ, from Proto-West Germanic auwju, from Proto-Germanic awjō, from Proto-Germanic agwjō — water.

Ancestry of “Cornwallis”, step by step

StepLanguageWordMeaning
1EnglishCornwallisfor someone with Cornish ancestry
2Old EnglishCornwealasCornwall, inhabitants of Cornwall
3Old EnglishWēalasthe Welsh
4Old Englishwealhforeigner; Briton or Welshman; slave
5Old Englishīeġisland
6Proto-West Germanicauwjufloodplain; meadow; island
7Proto-Germanicawjōfloodplain; meadow; island
8Proto-Germanicagwjō
9Proto-Indo-Europeanh₂ékʷeh₂water
Every word from Proto-Indo-European h₂ékʷeh₂Every word from Proto-Germanic agwjōEvery word from Proto-Germanic awjō