1851 census has the following Wixon family in Kingston Blount:
Classs: Ho107, Piece: 1726, Folio: 185, Page: 27
The Street, Kingston Blount, Oxfordshire
John Wixon, 1822 ON FindMyPast, but not FS?
Jane Wixon, 1827, b Tetsworth, Oxfordshire
James Wixon, 1841 b Kingston
William Wixon, 1843 b Kingston
(From FamilySearch, and a free index search on FindMyPast!)