“Vergil was a subroutine built into the larger Superintendent artificial intelligence construct of New Mombasa. It later merged with Quick to Adjust, a renegade Covenant Huragok who would subsequently be known as ‘Vergil’ among many humans.
[. . .]
The name Vergil itself is likely a reference to the Divine Comedy, specifically to Virgil, the poet that guides fellow poet Dante through the nine circles of hell and purgatory, much in the same way the Rookie is guided through a metaphorical hell-on-earth, a destroyed New Mombasa, and also through the nine ‘circles’ of audio logs, a reference to the nine circles of hell.” —Halopedia, August 5, 2019
Learn more about Bungie’s 2009 video game Halo 3: ODST here.