Origin of the name Jessica: Of uncertain derivation and meaning, Jessica might be an elaboration of Jessie, which was originally a pet form of Janet and Jean. Alternatively, it can be interpreted as an elaborated feminine form of Jesse, which is derived from the Hebrew yīshai (gift).
Origin of the name Jessie: Originated as a pet form of the names Janet and Jean (God is gracious). Now, however, it is more commonly used as a feminine form of Jesse, which is derived from the Hebrew yīshai (gift).