Castiel is of Hebrew origin, meaning "my cover is God, shield of God". Names referring to El, a word meaning “might, power, god" or "deity” and (a) god in general, and hence in Judaism, God and among the Canaanites the name of the god who was the father of Baal. Theophory in the Bible refers to the practice of embedding the name of a god or a deity in, usually, a proper name. Much Hebrew theophory occurs in the Bible, particularly in the Old Testament. The name Castiel does not appear in the Bible. The name appears after the 13th century.