lol, I never thought about scheme/racket naming in this context.

Is this an inside joke in the community or maybe even a an official take?

Scheme was the third in a series of languages designed at the MIT AI lab; the first two were Planner and Conniver. The third was going to be called Schemer, but ITS only allowed 6-character filenames (because, encoded in sixbit, that fits in one machine word). Thus the pattern was established from the very beginning.

Also consider that another widely-used scheme implementation is called Guile.