Continuing on the theme of .NET languages, here are a few more:
P# is a Prolog implementation designed for the .NET Framework.
S# is a complete modular redesign of the Smalltalk language, offering cross-language integration and component based deployment.
The good news is if you’re planning to create a .NET language using the same naming scheme you still have 21 other letters of the alphabet to choose from. But you may want to avoid I#. The name is already used for a pencil sharpener that looks like an old iMac.