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I've attended 2014 LLVM Developers' Meeting. Everyone there pronounced it as "klang" so that's how I pronounce it as well.

No, you're not crazy. Some people definitely pronounce it C-lang, while others produce a banging sound (klang). I prefer the banging sound ;)

Klang is also the German for "Sound"

How else should you pronounce it? (i.e. I do this too, never thought about it before)

> How else should you pronounce it?

Exactly like the metallic "clang" http://www.thefreedictionary.com/clang which originates from the latin clangere