Ann Cannell is the most renowned Cannell in my tree who married Robert Wade in 1790 and there is a small lifelike doll of her in the Manx Museum.

If you haven't done so already, you might want to have a look at the following site
iomfhs.im/lawsons/manx_law/v5/cannell.pdf
Note, this does take a while to load up, but there's loads of info that might be of use to you.
See also the Manx Notebook found on the green tabs above and if you have the CD, you'll be able to find the surname Cannell with ease.