Chet Manley is a cover alias used by Sterling Archer, which Archer let Cyril 'borrow'. Cheryl is turned on by meeting "Chet", to which Pam comments "Not a different person," resulting in Cheryl getting combative and proclaiming "I saw him first!"
As of Season Four, Cyril seems to have completely adopted the alias. Using it in both Live and Let Dine and Sea Tunt: Part II. Archer seems to have abandoned it himself, opting both times to use a different codename.
- ... chet manly is the name of the intern *krieger kills on his first day of work. season 2 episode 3.