Definitions of Isaiah:

• noun:   an Old Testament book consisting of Isaiah's prophecies
• noun:   (Old Testament) the first of the major Hebrew prophets (8th century BC)
• name:  A male given name (rare: 1 in 9090 males; popularity rank in the U.S.: #635)
• name:  A surname (very rare: popularity rank in the U.S.: #56550)