We've been calling it Cinder internally for years, long before we thought about opening it up. If we wanted to make it a big branded thing, we'd work on finding a unique name for that, but we aren't trying to do that, we're just opening the code to make it easier to share work with upstream and other people working on CPython performance. We hope libcinder keeps the mindshare around the "cinder" name.

Pretty sure they were calling it cinder inside of instragram long before open sourcing it.

Came here to say that. They did the same thing with an iOS app called Paper. The ethics are strong with this one.