This image comes for sheet Oxfordshire L.3 of the first edition Ordnance Survey County Series maps of England and Wales at 1:2,500. It is of the wonderfully named Christmas Common, in the Chilterns.
There are a number of suggestions for the name, a possible truce at Christmas during the Civil War or for the number of Holly Tree coppices in the area though a local family called Christmas sounds the most likely.
There are 8 place names which begin with Christmas listed in the gazetteer for the Ordnance Survey 1:50,000 series, including the wonderful Christmaspie in Surrey (this image from the 3rd ed OS 1:2,500 sheet Surrey XXIII.13, 1910. Only the first edition was available in colour as well as black and white).
Happy Christmas everyone.