Crane/Crain is indeed a Manx name - however 1630 is a somewhat early date for Manx emigration - see www.manxnotenotebook.com/famhist/genealgy/emig.htm
You should via american sources be able to get your family back to the 1840s and see if & when a mention of the Island first occurs.
Manx Genealogy Archive 2 is maintained by isleofman.com
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