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There hasn't been one called "cougar," which is a scary-cat name people think of, I think. Of course, "cougar" is another name for the puma, but then, so is "mountain lion," so that may not be a barrier.

Cougars(/pumas/mountain lions) are also interesting because they're not big cats, taxonomically speaking, so potentially the entire felidae family is in play, and it's pretty big. "Lynx" is a possibility... maybe also "wildcat" or "bobcat"? http://en.wikipedia.org/wiki/Felidae

Wildcat was already used as the codename for the iPad, though I suppose it's possible they could repurpose it.

I'd vote for Wildcat

Looking at Wikipedia there is Clouded Leopard mentioned under the big cats entry: http://en.wikipedia.org/wiki/Clouded_leopard

I'm personally waiting for Thundercat.

I vote for Sabertooth.