Side note, I was surprised there was no 'a' after code. I have been reading it as codeAcadamy the whole time. Interesting how something looking different can cause you to pay more attention.
This is because CodeAcademy (with the a) already existed (using the domain codeacademy.org). They changed their name to "The Starter League" in Sept 2012 [1].
Founder of Code Academy (now The Starter League) here. Thanks for clarifying this! It seems we'll never live it down. Happy to share more about our experience and how we dealt with the conflicting name.
That's so funny - just like @joshdance said, I always read it as "Codeacademy". At least you have both URLs. I'd love to see a blog post one day that explains why you've chosen this name vs. that name. Co-decademy is a meaningless word to me (that's how I read it - "co" as in "codependence") whereas Code Academy makes 100% sense to developers.