Ask HN: Can commercial backed language can become dominant?

The Go programming language is pretty much backed by Google. It really did not have a life outside of google AFAIK, when it burst onto the scene. It's now become the de-facto systems programming language. C is pretty much not used at the majority of places that need a lower-level statically typed, compiled language that needs no installed runtime; Go is now filling that use-case in a large majority of situations.

Java was created by Sun Microsystems.

SQL was created by IBM.

C# was created by Microsoft.

I don't know if your question was intended to mean "commercially successful" or if by commercially-backed you may have meant "closed source".

Maybe Typescript?