We also need to re-assess the origins of the name, in line with other Manx surnames. It appears that many names consist of a root, in the genitive, and an ending which is a diminutive, or a sort of adjectival ending.
Many names have -es or ace at the end, others have agh or augh, others have -en, -yn or in.
The connection with Christ postulates that the family were in some way distinctive in their Christian belief, at a time shortly before surname formation occurred. However unless part of the population out in areas like Andreas and Bride had settled surnames a long time before the rest (possible!) then we have a situation where the Norman style names that may have arisen during the Scottish suzeraincy are a lot younger than the Christian surname. I am also interested in the relationship with and distribution of Christory.
It has been an unspoken possibility that the Christians were settlers from the Isles, but exactly when and how this chimes in with surname formation is difficult.