Hi Christine,

I would recommend starting here:

www.iomfhs.im/default.aspx?CategoryID=22

Go through the Kissack wills from that period and you might get lucky and find one that mentions a William in America.

You could also try Frances' Manx Notebook:

www.isle-of-man.com/manxnotebook/famhist/wills/index.htm

I assume you already know about the Kissack Genealogy site?

www.kissack.co.uk

Good luck,

Greg