I was curious about the origin of the name Chenoweth, and a quick Googling turned up the information that it was Cornish for ‘new house.’ I looked it up in my copy of T.F.G. Dexter’s Cornish Names and there it was, Chynoweth (stressed on the -no-), from ti (chy) ‘house’ (cf. Irish ti(gh)) and nowyth ‘new’ (cf. Irish nua). But I am rarely content with a quick Googling, and a little further investigation turned up the website Cornish Surnames. It’s an amateur effort and carries the charming caveat:
The etymology of surnames is not an exact science, there may be errors on these pages, the definitions come from books by Richard Stephen Charnock, G. Pawley White, T. F. G. Dexter, J. Bannister, Henry Jenner, Nicholas Williams, R. Morton Nance and many more. Some names may have multiple meanings, and I would love to hear from you if you have others I have missed.
But it’s well worth browsing through, and a lot easier to access than the obscure books it draws on.