Some sources claim that another letter dated 17 September 1888 was the first to use the name "Jack the Ripper", but most experts believe that this was a fake inserted into police records in the 20th century.
Nogle kilder angiver at et andet brev fra 17. november 1888, var det første brev der brugte aliaset Jack the Ripper, men de fleste eksperter er af den holdning at brevet er falsk og blev sneget ind i politiets arkiver i det tyvende århundrede.