The name is verified by in-game jukebox.
Wolfenstein 3D (DOS)
Twelfth Hour is played in E3M3, E3M7, E6M3, and E6M7. It is track 23 in the data files.
This song is not in the shareware release of Wolfenstein 3D.
Title in the IMF meta data is "12TH".
Spear of Destiny (DOS)
Twelfth Hour is played in level 9. It is track 11 in the data files (though it is not included in the demo release).
Title in the IMF meta data is "TWELFTH".