I don't want to spoil the party but it is highly unlikely that your ancestors had any claim to a coat of arms (you need to descend via male line via eldest son and it would appear that there is some query in your descent even from the Manx Christians) - you might like to read www.manxnotebook.com/famhist/abear.htm but it is of course a pretty picture to have.

By the way the Christian residence on IoM was Milntown - however the original was destroyed and rebuilt early 19th Century - see www.manxnotebook.com/gazateer/houses/milntown.htm.
The house was lost to the Christians by default of mortgage - see history of Wm Bell Christian