... I wonder what nelwild's interest was? Does her family link into the Mayo's as well, do you know?
I think nelwild was probably just helping out. 
Some more census info (from 
https://familysearch.org/ )below that I think are the same family. 
I couldn't find a place called "Hayfield" in Sussex or an "Arfold". Maybe he meant that he was literally born in a 
hay field  1861 census Lyam Road, Lambeth, Surrey
George Mayo   Head   M   25   
Hayfield, Sussex - labourer
Elizabeth Mayo   Wife   F   22   Lambeth, Surrey
William G Mayo   Son   M   1   Lambeth, Surrey
MarriageMarch 1859-Wandsworth
George 
Mayo - Elizabeth Damaris 
Messengerhttps://www.freebmd.org.uk/1901 census Ockford Road, Godalming, Surrey, England
George Mayho   Head   M   64   
Arfold, Sussex- Carpenter Journeyman
Damaris E Mayho   Wife   F   60   Norwood, Surrey
Jane E Mayho   Daughter   F   28   Farnham, Surrey
William A Howard   Boarder   M   33   Aldershot, Hampshire