Sorry...all I have on the HENTHORNs is what I listed in my post.
Have you checked (really SEEN) the tombstones of the immigrants? Sometimes they engraved a birthplace on the stone and frequently, this extra info is not included in any readings done by historical or even genealogical societies! Request actual photos.
Have you checked the Immigrant Ships Transcribers Guild (ISTG) online? They are always updating!
Have you checked the internet using different search engines & spellings? Have you checked the UK databases?
Have you checked for Irish estate records, wills, registry of deeds, Catholic parish records, tithe applotment books? You might even try the web site for the Central Ohio Catholic diocese as it includes the churches in the Newark area & they have a wonderful publication.