There's a Martha Guppy baptised in Thorncombe on 16 Aug 1801 d/o William and Elizabeth. That's much closer to Hawkchurch and the village where Robert appears on censuses.
Berks / Oxon: Eltham, Annetts, Wiltshire (surname not county), Hawkins
Dorset / Hants: Derham, Stride, Purkiss, Scott
Yorkshire: Pottage, Carr, Blackburn, Depledge
Sussex: Goodyer, Christopher, Trevatt
Jersey: Fowler, Huelin, Scott
Essex/Herts: Livermore, Holgate, Law, Day, Myson, Boyton
Norfolk/Suffolk: Stone, Alexander, Tipple, Ingate