Thanks for that, HS. I can only suggest that Fiona Kendall was a direct descendant of Marie Kendall (sorry, I used the Irish spelling Maire in my last post!).
I guess that the chances are very much that John McCarthy did at some point set eyes on Mary Kelly's murderer. I do recall reading (not on these boards) the Canadian theory that he was actually the Ripper, but it didn't sit with me. All very interesting, though.
We are suffering from a plethora of surmise, conjecture and hypothesis. - Sherlock Holmes, The Adventure Of Silver Blaze