Using the Oxfordshire Family History Society search suite, I think I may be able to help on this one.
An Elizabeth WILLIAMS was baptised in Hanborough on 9 October 1808, the daughter of George and Christian from Ensham [Eynsham].
Christian LEIGH (LAY), daughter of Thomas and Christian was baptised in Eynsham on 5 August 1787, which provides a link to the Thomas LAY who let the will.
The only possible marriage I could find was between George WILLIAMS and Christian Ann LEE in Oxford St Ebbe on 24 August 1807. The couple are described as "lodgers", as are many of the couples there at that time.
I could not find any other children for George and Christian WILLIAMS in Handborough or anywhere else in Oxfordshire, nor could I find any obvious burial records for the couple.
I hope this helps.