late 12c. (Old English used hælend "savior"), from Greek Iesous, which is an attempt to render into Greek the Aramaic proper name Jeshua (Hebrew Yeshua) "Jah is salvation," a common Jewish personal name, the later form of Hebrew Yehoshua (see Joshua).
As an oath, attested from late 14c. For Jesus H. Christ (1924), see I.H.S. First record of Jesus freak is from 1970. Jesu, common in Middle English, is from the Old French objective case.