Hi,
Sorry that I haven't replied sooner but I've only just seen your reply
I think Ingram was quite an unusual name on the Isle of Wight. In 1841 I can only find 21 and considering that a lot of these were wives and children born much later than 1789ish it looks like there were only a few in the 18th century.
As to William's abduction I think it is a very plausible story. If you Google "Impressment" and/or "press gang", pressganged etc you can find out much info about what was happening around this time. William would have been about the right age for that to have happened during the Napoleonic Wars.
With Portsmouth being just across the Solent from the Island I wouldn't be at all surprised if the Press Gangs didn't go over to find more people.
http://www.welcometoportsmouth.co.uk/press%20gangs.html The following are excerpts from "The Story of the Isle of Wight" by Edmond J HUNT to give an idea of the situation on the Island around the time of William's birth and childhood.
"The year, 1795 heard the note of war's alarm once more on the Island and this outpost of England was converted into an armed camp; for the great struggle with Napoleon had commenced and the fear of invasion was again upon the people of the Wight.".....
"During this anxious time many troops were quartered on the Island; Parkhurst Barracks contained its full complement"....
http://en.wikipedia.org/wiki/War_of_1812This could explain how he ended up in America
Regard,
Daisy