It seems entirely plausible that people could have changed their surname from Harry to Harris around that time anyway. Harris means "of Harry" and would have started out as the patronymic surname of someone whose father was called Harry, like so many Welsh surnames. If you look at families with the surname William on the 1841 census and follow them through onto the 1851 census a lot of them have become Williams, so I can well imagine the same thing could happen with Harry / Harris. (Also it would be easy to scrawl the "is" at the end of Harris so it could look like a "y")
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