i dont know if you have the following information, but i have a copy of his birth @ death certs. birth cert. no 395, born 5th aug 1862, name Joseph Carey, fathers name Joseph Rockley Merrick, mothers name Mary Jane Merrick formerly Potterton residing in Leicester. death cert. no 133, 11 april 1890 at london hospital, Joseph Merrick aged 28 of no occupation residing in london hospital. cause of death, asphyxia during sleep from weight of his head, the deceased suffering from an overgrowth of skin & bone. certificate recieved from wynne & baxter coroner for county of london inquest held 15 april 1890.
there is a bit more on each of the certs such as the address in leicester where they lived but the writing is so bad that i cant read it. hope the above has not put you off your cornflakes! regards Keith in Hereford.