There is a naming tradition in the Lisp world, which Racket devs apparently have chosen over searchability.
Qualities or activities that have negative connotations. Guile. Gauche. Larceny. Racket.
I think it started with theorem provers - Planner, Conniver. Then Scheme[r].
I don't think Gauche fits there. There is a tradition of naming with synonyms for "scheme" (as in a criminal enterprise) like the others you listed, with some more peripheral ones like Gambit, Ruse, Artifice.
A funny thing was, when the rename to Racket was still fairly new, someone started looking into adopters in the finance space.