« Reply #5 on: Tuesday 11 December 12 16:19 GMT (UK) »
In 1841, there is a Mary Halls aged 25+ living in a Halls household in Halls Cottage in Merton.
Immediately above them is a Gifford household that includes a George Latey, aged 4. He is separated by a single line from the Gifford household, indicating he is not a child of theirs but rather is some other relation or a nurse child or boarder or visitor. (Anc'y pulls its usual trick and transcribes him as if he were in a household of his own.) The Giffords don't seem to be related (probably Thomas Gifford and Eliza Lewis married 1838).
I can't find any further trace of that George (in 1851 or in BMDs).
But with Mary having "come to the parish" ... she may very well have left again by 1841, and may also have partnered with someone else and used his surname ...
Do you have information about her and/or George later in life? The name George Seldon Halls doesn't appear in the GRO index.
HILL, HOARE, BOND, SIBLY, Cornwall (Devon); DENNIS, PAGE, WHITBREAD, Essex; BARNARD, CASTLE, PONTON, Wiltshire; SANKEY, HORNE, YOUNG, Kent; COWDELL, Bermondsey; COOPER, SMITH, FALLOWELL, WILLEY, Notts; CAMPION, CARTER, CRADDOCK, KENNY, Northants; LITTLER, CORNER, Leicestershire; RUSHLAND, Lincolnshire; MORRISON, Ireland; COLLINS, ?; ... MONCK?