Hi Bill,
this dagger was also discussed on Bernard Levine's forum and I posted a link to illustrations from 'Hunchback' which conclusively ID'ed this as Esmeralda. I feel that originally this dagger was themed on the story. However, later owners may indeed have believed it was satanic (as the story's fame subsided) and could have even been used as such
The picture (dated 1877) clearly shows various details, the necklace, the goat (Djali), the tambourine etc
The second picture shows Notre Dame with a spire, which may explain the scabbard. This is dated 1911 but I believe at that time the spire was no longer there.
Regards David