cuh-knee pex. cuh (said very fast) knee (emphasized, as in your knee), pex (said like a second word). I know, weird, but that's how I heard it on one of their youtube videos. Go to this video at 3m 22sec
I have also heard it pronounced Kuh NIP ex, but the company's videos pronounce it the first way.
I thought it was "nip'- pex"."cuh-knee pex" got it! I would have never thought it that way.
I thought it was "nip'- pex".

I was originally too lazy to email, but did it a few days ago. Got my hat, 3 stickers, a cd, and a paper catalog in 3 business days! Hand written address labels too.