My great-grandfather, Joseph Eli Mayo, was born in Quebec in 1846. Immigrated to U.S. in 1870 and settled in Alpine County, California where he married Maria Wells on 29 March 1882. He died there 19 June 1915. We know nothing of his ancestry. Because we know he was French Canadian, it seems likely that "Mayo" was the anglicized spelling of his name. Do you have him in your records?