precious stone, c.1300, from Anglo-French jaspre, Old French jaspre, jaspe, from Latin iaspidem (nominative iaspis), from Greek iaspis "jasper," via an Oriental language (cf. Hebrew yashpeh, Akkadian yashupu).
masc. proper name, English form of Caspar or of Gaspar, the traditional name of one of the Three Kings. Said by Klein to be of Persian origin and meaning literally "treasure-holder." Used from 1896 for "a rustic simpleton."