If you make a deal with the Devil, you lose your soul, but also, you don’t get the thing you sold it for, because the Devil is the prince of lies.
In any case, while we’re trying to exorcise the old boy, I found a list of Satanic nicknames assembled by the Dictionary of American Regional English between 1965 and 1970, which you may enjoy deploying, such as Old Booger Man, Old Lutherfud, and Error.
Incidentally, Jimmy Squarefoot may stand out to you as it did to me: he’s an obscure mythological boar-headed biped from the Isle of Man, associated with the (also obscure) Manx Pig Legend. He’s not particularly a devil figure.
Jeff says: I wish this list included the locations for each name. Papa Legba, not mentioned, is a fascinating Vodou figure who isn’t a devil, but has often been mistaken for one. The Talking Heads and Pops Staples did a song about him, too.
Romie: Seconded on wishing there was a distribution map. I wonder whether they’d give you the expanded data if you e-mailed. Meanwhile, a copy of True Stories has been on my “want” list for a while; I’ve been holding out in hopes there’d eventually be a remastered version, but this is probably foolish.
Edward says: “Most Immediate Enemy” gets my vote for most apropos.
Angela says: Error is so perfect. BRB; writing sci-fi version of “Young Goodman Brown.”