Revelation 22

Alpha : a title of Jesus Christ

David : a son of Jesse of Judah; king of Israel,son of Jesse of Judah; king of Israel

John : a son of Zebedee; younger brother of James; the beloved disciple of Christ,a relative of Annas the high priest,a son of Mary the sister of Barnabas, and surnamed Mark,the father of Simon Peter

Omega : the last letter of Greek alphabet