Joshua

late Old English, "one who heals," especially "savior, Jesus," agent noun from heal (v.). As "a curative medicine" from late 14c. The usual Old English noun for Jesus as savior was hæland (Middle English healend), a noun use of a present participle, being a rough translation of the name (see Joshua) or of Latin salvator.

Old English osanna, via Medieval Latin hosanna, Late Latin osanna, and Greek ossana, hosanna, from Hebrew hosha'na, probably a shortening of hoshi'ah-nna "save, we pray" (see Psalms cxviii.25), from imperative of y-sh- (compare yeshua "salvation, deliverance, welfare," for which see Joshua) + emphatic particle -na. Originally an appeal for deliverance; used in Christian Church as an ascription of praise, because when Jesus entered Jerusalem this was shouted by Galilean pilgrims in recognition of his messiahhood (Matthew xxi.9, 15, etc.).