and of course for added fun placenames evolve too and swop back and forth even in the Parish Registers so Honyngham and Hunningham, Warwickshire are used by different ministers for births in 1860-80's and Hampstead Noreys & Hampstead Norris, Berkshire being recent off the top of my head. Just the phonetic variation then have the villages like Bugsworth, Derbyshire where the parish council decided should be Buxworth as they didn't like Bugs.
But to get back on topic Wetherall, Weatherall, Wetheral, Wetherel, Wetherill etc sometimes with the officiating minister writing it one way and the bride or groom signing another on the GRO/Parish entry.
What I find harder to understand is how Rymell became Ryman and then back to Rymill
Rymell / Rymel / Rymele / Rymill / Rymal / Rymall / Rimell. Ryman / Rymen / Riman.