where in the USA did he live - have you other details eg age at death, census sightings, names of children.
There were at least 2 Wm Caleys born with 4wks of each other in 1812 in Lezayre that match however there are two possible matching marriages - also from the start of significant Manx emigration nearly all of this group emigration was to Ohio and the emigrants came from the north west parishes rather than Lezayre.