We chose "Isis" as the name of the framework because the original authors lived (still live) in Oxfordshire, and the River Thames is called Isis when it flows through Oxford.
So, in thinking about the name of a language for Isis, I hit upon a bad pun that "source" is a "source programming language" but also the "source of a river". The source of the River Thames is officially a place called Thames_Head, which isn't much of a name, but it's very close to a village called Kemble, which is (I think) a great name.
https://en.wikipedia.org/wiki/Thames_Head
Thoughts?