I was in Truro, Cornwall, England a few years ago at a Historian's library. I talked to the librarian briefly (she was getting ready to close) about the name Guin and all variations. She said it was a Welsh name and that many Welsh people came to Cornwall at some point in time. The name means fair-skinned, I believe the dictionary said. One book written by Jesse Blaine Gwin, History of the Gwin Family, claims they came from Wales. I believe it's the Quinn's who came from Ireland. Peggy Guinn Bowen CA