Looking at Gloucestershirebdm - think Mary Anne's maiden name was GAY
CLDS: Christening at Oldland Glos - 28 April 1824 - Mary Ann GAY - parents Isaac & Jane.
(Bitton/Oldland - is quite close and some of my tree, say born Bitton, christened Oldland)
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1841 Census, Mon. Trevethan - Registration District: Pontyppol
Samuel JENKINS - 25 - Miner, not born in County
Mary - 25 - born in County
Samuel - 2
Anne -6 months
Samuel GREEN - 6 months
Mary Ann THOMAS - 10 - Female Servant
1851 Wales Census
Aberystruth,
JENKINS
Samuel - 36 - Iron Miner - born Glos. Newland
Mary Anne - 27 - born Glos. Bitton
Samuel - 12 - born Mon. Trevithin
Ann Maria - 10 - ditto
Simeon - 8 - born Llanfrecha ***
Levi - 2 - ditto
Ruth - 1 month - born Aberystruth
***
http://www.sungreen.co.uk/Broadwell/Miles-Harris-1935.htm
'Mary was the daughter of Simeon JENKINS & Sarah (nee HOPKINS) from Bream. Simeon was the son of Samuel JENKINS of Bream)'
1861 Census, West Dean - Bream St Peter
Dark Hole
JENKINS
Samuel - 46 - born Glos. Bream
Mary - 38 - born Glos. Bitton
Simeon - 18
Seoi - 12
Rush (Ruth) - 10 - born Blaina
Calbe - 8 - born Bream
Elizth - 6 ditto
John - 5 ditt
Jane - 2
1871 Census, Bream Eaves & Mill Hill
JENKINS
Samuel - 55 - Coal Proprietor
Mary Ann - 47
Celeb - 18
Elizabeth - 17
John - 15
Jane - 13
Obert - 11
Agness - 5
1881 Census, Mill Hill
JENKINS
Samuel - 66 - Coal Miner,
Mary Ann - 59 - born Bitton
Caleb - 28 - West Dean
Agness - 15 - Grocers Assistant