The Harper Collins paperback copy that Sharlene has, has "Conan" rather than Cohan on the front cover. I would have responded sooner, but I couldn't find the book.
But I don't think this is a mistake - the blurb on the front is saying what Terry is parodying in the book - "From the apocalypse to Conan the Barbarian, more sidesplitting Discworld fun!"
Look, you've got it all wrong! You don't NEED to follow ME, You don't NEED to follow ANYBODY! You've got to think for your selves! You're ALL individuals!
Yes! We're all individuals!