Do you know any non-Lisp languages other than Dylan, Perl 6, LiveScript and (to an extent) Tcl that support or maybe even encourage kebab case identifiers?
Hyphens aren't case, so calling it anything-case is silly. Whether underscores or dashes separate (or a mixture of both) is orthogonal to whether identifiers are case sensitive, and whether that is exploited.
123-456 is an identifier in ANSI Common Lisp; nothing in its name has case. FOO-BAR and foo-bar produce the same symbol under the default read-table; case is folded and so not involved.
