From GenUKI:
"MARSTON-MAISEY, a parish in the hundred of Highworth, county Wilts, 3 miles N.E. of Cricklade, its post town."
"Alias Meysey Hampton. Marston Maisey (Wilts.) was formerly a tithing and chapelry of (Maiseyhampton), and there are some documents relating to Marston Maisey with the parish records."
(Ref: Guide to the Parish Records of the City of Bristol and the County of Gloucester; I. Gray & E. Ralph, 1963)
"MEYSEY HAMPTON, (or Maiseyhampton), a parish in the hundred of Crowthorne, county Gloucester, 6 miles E. of Cirencester, and 2 W. of Fairford, its post town.