If "Cohen" is "John Doe" why aren't the asylum records littered with Cohens?

[Scott Nelson]

Sorry, I meant the OP, how did Martin reach the conclusion that David Cohen was a genetic catch all name?

Wether Cohen and Kosminsky are one and the same? That's not quite resolved yet...

See Roger's post #10 for the answer. Fido subsequently decided the John Doe explanation was infeasible.

Just to clarify my own belief -- that the violent, insane tailor, David Cohen's European name was "Aaron Kosminski" because "Aaron" was Cohen's first name and "Kosminski" was his last name (my belief -- unproven) before he changed it. And wandering in Whitechapel at the same time was a second "Aaron Kosminski" (Abrahams) -- the enfeebled former hairdresser.

Thus, there may be some merit in Fido's confusion hypothesis.