What does the name Jessica mean and where in the world does it come from?

"This name was first used in this form by Shakespeare in his play 'The Merchant of Venice', where it belongs to the daughter of Shylock. Shakespeare probably based it on the biblical name http://www.answers.com/topic/iscah-first-name which would have been spelled Jesca in his time. Jessica is also sometimes used as a feminine form of http://www.answers.com/topic/jesse-2." This info is from the Yahoo answers database I didn't write it.