As I said in my own post, Jesca was the Elizabethan form of the original Biblical name (probably partially via I -> J switching, also seen in such names as
Iason ->
Jason and Iakobos ->
Jacob), and
Jessica's simply an elaboration of that.
I used to theorise that
Jessica could be a combo of Iscah and
Jesse, but was proven wrong upon further research. Shakespeare probably actually combined Jesca and the original Iscah to arrive at
Jessica.
Miranda
Top 10 Reasons Why I Procrastinate:
1.
Proud adopter of 15 punctuation marks; see my profile for their names.