In my search I have come across the first name "Blissanti." As this is a unusual first name would anyone know the origins of this name which could lead me to break down this brick wall?
Where did you encounter this name, and are you certain of your reading of it?
By "where", I mean both geographical location and the type/age of the record. These can narrow down the possibilities.
In terms of American name usage, nothing like "Blissanti" has ever shown up in the SSA's name lists; the closest they get is Bliss, which occasionally showed up at the very bottom of the list as a masculine name in the early decades of the 1900s, and has seen similarly-rare use as a feminine name since about mid-century.
I have found references to BISSANTI as a rare surname (probably of Italian origin) and used as an even rarer first name. Just as I know someone who called herself "Rosetti" when she came to England (whereas I'm sure she was thinking of "Rosetta"), these variants are inclined to appear - as first names or surnames. Who knows if was originally recorded as something similar and the holder of the (altered) name decided they liked the misspelled variant and just kept it that way!