α. early Middle English bacstan, Middle English bakston; English regional (chiefly northern, north midlands, and west midlands) 1500s backstoone, 1500s– backstone, 1600s 1800s backstane, 1600s 1800s backston, 1800s backstan, 1800s backstun, 1800s bak'stwun, 1800s bakstan, 1800s bakston, 1800s bakstone, 1800s bakstun, 1800s baxston, 1800s baxstone, 1800s baxtan, 1800s baxton, 1800s baxtone, 1900s– bakst'n.
β. 1600s– bakestone.