More on this. Charles Kaighin came over with his father also Charles. I have a letter written by the father to his nephew (a third Charles Kaighin) residing in NYC on Cherry Street in 1841. See http://www.kaighin.com/FamilyHistory/References/1841_Letter/7400_Letter.htm

There was also an article I read somewhere that I don't have anymore that mentioned several Manx names attending a function at the Bridge Street Methodist church. I believe that was in the Brooklyn Daily Eagle archive or the NY Times archives. That might be a lead worth chasing.

And here are some useful links for researching in Brooklyn and NYC:

Brooklyn Daily Eagle:
http://www.brooklynpubliclibrary.org/eagle/

Map of Brooklyn in 1874 (requires Mr Sid browser plugin)
http://lcweb2.loc.gov/gmd/gmd380/g3804/g3804n/rr003520.sid

Greenwood Cemetery Database:
http://www.green-wood.com/bur_search.asp

Kings County Genealogy Forum:
http://genforum.genealogy.com/ny/kings/

NY Public Library database search:
http://www.nypl.org/databases/index.cfm?act=2&sub=144