[draegtun]

Perl6, Clojure, Racket, Rebol, Red, Factor & Forth are some other languages that allow hyphenated names.

And I agree with you that hyphens are more readable. They're also good for adding extra semantic meaning - https://news.ycombinator.com/item?id=3978992

[kazinator]

Add to that list, GNU Make. In gmake, you sometimes need things that look like paths to be variable names:

   VAR_$(PATH) := whatever

where PATH could be path/to/foo-parser.o, say.