That is why CLR used to mean Common Language Runtime, and there were so many languages on the launch event and .NET SDK bundled on computer magazines back in 2001.

Then the Windows only focus (for a while there was Rotor), and Microsoft being Microsoft, all that interest faded away and people focused on the JVM, even though MSIL was designed for all kind of languages (well dynamic came later with Iron languages and DLR), including C and C++.

Nowadays CLR almost feels to have changed into C# Language Runtime, given the C# centric decision on modern .NET design.