noun

• An English ethnic surname transferred from the nickname for someone with Cornish ancestry.
• A placename:
• A neighbourhood of the City of Hawkesbury, New South Wales, Australia.
• A coastal settlement west of Auckland, Auckland region, New Zealand.
• The Rural Municipality of Cornwallis, a rural municipality in south-west Manitoba, Canada.
• An unincorporated community in Ritchie County, West Virginia, United States.
• Ellipsis of Cornwallis River.
• Ellipsis of Cornwallis Island.
• Ellipsis of Cornwallis Township.