Many thanks John for the information.
I did do a Google search before posting but as you note the word "Christiana" (without the "i" by the way) pops up a lot. It seems to be the old name for Oslo as well as a girl's name and more than one town and river in the US, all of which hamper the search for the schooner that I am after.
Unfortunately there are lots and lots of ships and schooners under the name, many hailing from Scandinavia and others from the eastern seaboard of North America. I am thus really hoping to tie down some information about this Manx related one, as I cannot be sure that the others are "mine", but once again many thanks for trying, its a nice spirit on this board for mutual help.
Paul