Jesus (Gk. Iēsoús)Greek form of the name Joshua (Heb. yĕhôšûaʿ, “Yahweh will save”); cf. Luke 3:29; Acts 7:45; Heb. 4:8.1. The father of Sirach and grandfather of the author of the book of Sirach (Ecclesiasticus; Sir. Prologue).2. Joshua ben Sira (“Jesus son of Sirach”), author of Sirach/Ecclesiasticus.