I think that's in Portuguese? Touca is also the name of a bird (Toucan) in Farsi.
I wanted a name that is easy to type on the command-line (since that's the interface for many users), easy to pronounce, and somewhat meaningless in English. Touca was the best I could think of. :)
Having said that, our v2 launch last month was on the front page for about a day: https://news.ycombinator.com/item?id=34959276 ...but it was too little too late.