MABLETHORPE, MAPLETHORPE, MAPLETHORP, MAPPLETHORPE or MAPELTHORP... Marie or Maria; this will take a little resolving.
So far all the results I have collected suggest Mary Maria DIXON's maiden name is MABLETHORPE. It is only when I start to delve further and switch the surname to Maplethorpe that I start to obtain any meaningful results.
A quick search online shows a marriage in 1897 between one Samuel DIXON and one Mary Maria MABLETHORPE. At first glance this would certainly appear to give me my great grandmother's maiden name, though until I have documentary evidence to support this I will store it in the 'to be checked' tray.
Updates:
2015-03-18 Mablethorpe and Maplethorpe seem to be interchangeable; both being in use in various documents. I eventually settled on Maplethorpe.