That Clojure, the language, ended relying on Google's Closure (with a 's'), for its ClojureScript variant is one of the most WTF naming oddities of all times.

Clojure/Closure: I mean, seriously... Common. And it's somehow an accident: Clojure predates ClojureScript and Google Closure was not used by Clojure.

It's both weird and cool and highly confusing.